Page 149 - New Medley 4 Semester 2 PDF (Merged)

Operation of Time

Example 4: Anita completes her homework in 1 hour 15 minutes.
Then, she plays 1 hour 30 minutes. How much time did

she spend on these activities?
Solution: h min

Time spent in homework = 1 1 5

Time spent in play = + 1 3 0

Total time = 2 4 5

Thus, she spent 2 hours 45 minutes in all.

Note: Convert the time into the bigger units if the sum is

greater than 60.

Example 5: Mona and Ritu solved a sum in 10 minutes 40 seconds and

13 minutes 15 seconds respectively. Who solved first
and by how much?

Solution: First, compare the bigger units, i.e., 10 minutes < 13

minutes that means Mona solved the sum earlier.

min s
1 2 7 5

1 3 1 5

– 1 0 4 0

Difference between time = 2 3 5

Thus, Mona solved earlier than Ritu by 2 minutes 35
seconds.

Note: Borrow from the bigger unit and regroup in the
smaller unit if required.

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