Class 5 Mathematics — Chapter 12: Racing Seconds

What you'll learn

• ▸Reading Time on Analog Clocks
• ▸Calculating Elapsed Time (Hours & Minutes)
• ▸Comparing Time Durations
• ▸12-hour and 24-hour Time Formats
• ▸Understanding 'Seconds' as a Unit of Time
• ▸Estimating Time Duration (Seconds vs. Minutes)
• ▸Time Conversions (Hours, Minutes, Seconds)
• ▸Solving Word Problems on Time Calculations

Chapter Summary

--- PAGE 1 --- ChapterChapter 1212Racing Seconds 11 Min. Sec.22 Min. Sec.01:5533 Min. Sec. 01:5601:57 Raghav practices yoga in the morning. Let us find out 1. At what time did Raghav start practising Yoga? ………………. 2. At what time did he finish? ……………. 3. How much time did he spend practising Yoga? .................... 4. Find the time elapsed between the given time periods. Share your strategies. (a) 01:15 p.m. to 01:42 p.m.? (b) 03:18 p.m. to 08:18 p.m.? (c) 09:15 a.m. to 11:30 a.m.? 5. The table below shows the time taken by 3 children to paint a picture. Name Time Taken Raghav 1 hour 20 minutes Rani 2 hours 10 minutes Ritu 1 hour 35 minutes (a) Who took the longest time? (b) Who took the least time? --- PAGE 2 --- 6. Fill in the blanks by writing the time in the appropriate format. Time in 12-hour fromat Time in 24-hour fromat 05:30 a.m. 05:30 hours ………… 08:35 hours 11:55 a.m. ……… hours 02:30 p.m. 14:30 hours 05:30 p.m. ……… hours 09:35 p.m. ……… hours 7. Ma…

Practice Questions from this Chapter

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1. Explain time zones simply. Get Solution →
2. Convert a year into minutes. Get Solution →
3. Describe how sundials work. Get Solution →
4. What is the duration of Raghav's yoga practice shown in the picture from 01:55 to 01:57? Get Solution →
5. According to the table on Page 1, who took the longest time to paint a picture? Get Solution →
6. According to the table on Page 1, who took the least time to paint a picture? Get Solution →
7. What is 05:30 a.m. in 24-hour format as shown in the conversion table? Get Solution →
8. What is 14:30 hours in 12-hour format as shown in the conversion table? Get Solution →

Did you know?

• 💡 The Earth's rotation slows down by about 2 milliseconds every day.
• 💡 Ancient Egyptians were among the first to divide daylight and nighttime into 12 hours.
• 💡 The smallest unit of time ever measured is an attosecond.
• 💡 A peregrine falcon can dive at speeds exceeding 100 meters in under two seconds.
• 💡 Your brain can process a simple image in as little as 13 milliseconds.

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