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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: Ajay started his evening walk at 6:30 p.m. What time will it be
3 hours after the walk?

Answer: Time at which Ajay starts his walk = 6:30 p.m.

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

6:30 p.m. = 18:30 hours (on adding 12 hours to given time)

Therefore, 3 hours after the walk is 18:30 hours + 3 hours = 21:30 hours, that is

9:30 p.m. (21:30 hours – 12 hours, in order to get the 12-hour clock time).

Example 5: Suman woke up at 6:30 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 Suman woke up = 6:30 a.m.in the morning

40 minutes before 6:30 a.m. = 5:50 a.m. in the morning

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

Now, 5 hours before 5:50 a.m. = 12:50 a.m. after midnight

and 3 hours before 12:50 a.m. = 9: 50 p.m. in the previous night.

Therefore, Suman went to bed at 9:50 p.m. in the previous night.

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