CBSE Class 5 Mathematics Racing Seconds Worksheet Set 01

Fill in the Blanks

Question. Raghav practices yoga in the morning starting at 05:35 a.m. and finishing at 05:55 a.m., spending _____ minutes on exercise.
Answer: 20
Explanation: Subtract the starting minutes from the finishing minutes: 55 − 35 = 20 minutes.

Question. Convert into minutes: 2 hours and 45 minutes equals _____ minutes.
Answer: 165
Explanation: 1 hour has 60 minutes, so 2 hours have 120 minutes (2 × 60). Adding the extra 45 minutes gives 120 + 45 = 165 minutes.

Question. The time 05:30 p.m. expressed in 24-hour notation is _____ hours.
Answer: 17:30
Explanation: For p.m. times after noon, add 12 to the hour: 5 + 12 = 17, so it becomes 17:30 hours.

Question. A duration of 320 seconds is equivalent to 5 minutes and _____ seconds.
Answer: 20
Explanation: 5 minutes = 5 × 60 = 300 seconds. Subtracting 300 from 320 leaves 20 seconds.

Question. If a lunch break begins at 12:30 PM and lasts for 35 minutes, it will conclude at _____ PM.
Answer: 01:05
Explanation: 30 minutes brings the clock to 01:00 PM, and the remaining 5 minutes makes it 01:05 PM.

Question. There are exactly _____ seconds in 4 minutes and 8 seconds.
Answer: 248
Explanation: 4 minutes = 4 × 60 = 240 seconds. Add the remaining 8 seconds: 240 + 8 = 248 seconds.

Question. In a 200 m walking contest, the winning girl took 1 minute and _____ seconds.
Answer: 55
Explanation: The fastest walker, Sunita, clocked a winning time of 1 minute 55 seconds (01:55).

Question. A span of 75 minutes is equal to 1 hour and _____ minutes.
Answer: 15
Explanation: Take away 60 minutes to make 1 full hour: 75 − 60 = 15 minutes left over.

True or False

Question. Melting of an ice-cube typically takes only a few seconds.
Answer: False
Explanation: An ice cube takes several minutes at room temperature to turn completely into water, not just a few quick seconds.

Question. The time 02:30 p.m. is written as 14:30 hours in a 24-hour clock.
Answer: True
Explanation: In a 24-hour clock, you add 12 to the afternoon hour: 2 + 12 = 14, so it is 14:30 hours.

Question. Snapping your fingers is an action that takes seconds rather than minutes.
Answer: True
Explanation: A finger snap happens in the blink of an eye—well under one single second!

Question. Rani took 2 hours 10 minutes to paint a picture, which was less time than Raghav took.
Answer: False
Explanation: Raghav took only 1 hour 20 minutes, which is much shorter than Rani's 2 hours 10 minutes.

Question. One complete hour contains 3,600 seconds.
Answer: True
Explanation: 1 hour has 60 minutes, and each minute has 60 seconds: 60 × 60 = 3,600 seconds.

Question. A time of 09:35 p.m. in the 12-hour system corresponds to 21:35 hours in the 24-hour system.
Answer: True
Explanation: Adding 12 to 9 gives 21, so 09:35 p.m. is correctly written as 21:35 hours.

Questions / Short Question Answers

Question. Raghav studies four school subjects: Mathematics, English, Hindi, and EVS. He devotes 50 minutes to each subject. What is the total study time in hours and minutes?
Answer: 3 hours 20 minutes
Explanation: 4 subjects × 50 minutes = 200 minutes. Since 180 minutes make 3 hours (3 × 60), 200 − 180 = 20 minutes remaining. Total = 3 hours 20 minutes.

Question. Jyoti went out to play at 06:15 PM and returned home after 1 hour 45 minutes. At what moment did she reach home?
Answer: 08:00 PM
Explanation: 1 hour after 06:15 PM is 07:15 PM. Adding 45 minutes to 07:15 PM reaches the next full hour: 08:00 PM.

Question. Ragini required 1 hour 10 minutes to complete her homework. If she concluded at 09:40 PM, at what time did she begin?
Answer: 08:30 PM
Explanation: Count backward from 09:40 PM: 1 hour earlier is 08:40 PM, and 10 minutes before that is 08:30 PM.

Question. A group of schoolchildren departed for a picnic at 08:30 AM and returned after 4 hours 10 minutes. At what time did they arrive back?
Answer: 12:40 PM
Explanation: 4 hours after 08:30 AM is 12:30 PM. Adding 10 more minutes gives 12:40 PM.

Question. Raji started her evening assignment at 06:00 PM and completed it in 1 hour 30 minutes. At what time did she finish?
Answer: 07:30 PM
Explanation: Add 1 hour to 06:00 PM to get 07:00 PM, then add the 30 minutes to get 07:30 PM.

Question. Alya leaves her house to play at 05:30 PM and returns after 1 hour 10 minutes. What time does she step back inside?
Answer: 06:40 PM
Explanation: 1 hour after 05:30 PM is 06:30 PM. Adding 10 minutes gives 06:40 PM.

Question. It is presently 08:35 PM. What time will the clock show after 8 hours and 25 minutes?
Answer: 05:00 AM
Explanation: 8 hours after 08:35 PM brings us to 04:35 AM. Adding 25 minutes to 04:35 AM takes us right to 05:00 AM.

Question. How much time elapsed from 09:15 a.m. to 11:30 a.m.?
Answer: 2 hours 15 minutes
Explanation: From 09:15 to 11:15 is 2 hours. From 11:15 to 11:30 is 15 minutes. Total elapsed time = 2 hours 15 minutes.

Question. Raghu took 20 seconds to read a sentence, while Rani took 30 seconds to shade a rectangle. Who was faster and by how many seconds?
Answer: Raghu was faster by 10 seconds.
Explanation: Subtract the shorter time from the longer time: 30 seconds − 20 seconds = 10 seconds difference.

Question. Convert 1000 seconds into minutes and leftover seconds.
Answer: 16 minutes 40 seconds
Explanation: Divide 1000 by 60: 60 × 16 = 960 seconds (16 minutes). 1000 − 960 = 40 seconds left over.

Match the Following

Question. Match each time in the 12-hour format with its equivalent 24-hour railway clock time:

Explanation: In the 24-hour system, morning (a.m.) hours look the same, while afternoon and evening (p.m.) hours have 12 added to them.

Question. Match each common activity with the unit of time typically needed to complete it:

Explanation: Very quick actions take just a few seconds, while slower processes or conversations take minutes to finish.

Vocabulary Activity - "Guess the Word"

Question. Guess the Word: I am the tiny unit of time that is equal to 1/60th of a minute, ticked off by the thinnest hand on a clock. What am I?
Answer: Second
Explanation: A second is a quick tick of the clock. Sixty seconds pass to make one full minute.

Question. Guess the Word: I am a 24-hour time system often used by railways and airports that counts past 12:00 noon up to 23:59. What am I?
Answer: 24-hour clock (or Railway time)
Explanation: Railway stations use 24-hour time to avoid confusing 8:00 in the morning with 8:00 at night (20:00).

Question. Guess the Word: I am the Latin abbreviation placed after morning times between midnight and noon, meaning 'ante meridiem'. What am I?
Answer: a.m.
Explanation: "a.m." stands for the hours before noon, like breakfast time at 7:00 a.m.

Question. Guess the Word: I represent the total amount of time that passes from the start of an event to its end. What am I?
Answer: Elapsed time
Explanation: Elapsed time is the amount of time that ticks away between when an activity begins and when it ends.

Question. Guess the Word: I am a timing tool used in races to measure exact split seconds and minutes. What am I?
Answer: Stopwatch
Explanation: Coaches press a button on a stopwatch at the start of a sprint and click it the instant runners cross the finish line.