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Example 3: Hema takes 4 minutes 15 seconds to skip 200 times. How many
seconds is that?

Answer: Time taken by Hema to skip = 4 minutes 15 seconds

We know that 1 minute = 60 seconds

So, 4 minutes + 15 seconds = 4 x 60 seconds +15 seconds

= 240 seconds + 15 seconds

= 255 seconds

Therefore, Hema takes 255 seconds to skip 200 times.

Example 4: Alekh started his evening walk at 5:45 p.m. What time will it
be 3 hours after the walk?

Answer: Time at which Alekh starts his walk = 5:45 p.m.

Converting the 12-hour clock to 24-hour clock we get

5:45 p.m. = 17:45 hours (on adding 12 hours to given time)

Therefore, 3 hours after the walk is 17:45 hours + 3 hours = 20:45 hours, that is

8:45 p.m. (20:45 hours – 12 hours, in order to get the 12-hour clock time).

Example 5: Sumant woke up at 6:20 a.m. every day and slept 8 hours
40 minutes in previous night. At what time did she go to bed?

Answer: Time at which Sumant woke up = 6:20 a.m.in the

morning 40 minutes before 6:20 a.m. = 5:40 a.m. in the

morning Let us break 8 hours into 5 hours and 3 hours.

Now, 5 hours before 5:40 a.m. = 12:40 a.m. after midnight

and 3 hours before 12:40 a.m. = 9: 40 p.m. in the previous night.

Therefore, Sumant went to bed at 9:40 p.m. in the night.

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