Question

Darya and Kana are both practicing to swim in a

race. During practice, Darya swam 13 laps with
an average time of 23.5 seconds per lap. Kana
swam 10 laps, with an average time of 25.98
seconds per lap. It took longer for Darya to swim
13 laps than for Kana to swim 10 laps.
How much longer?
45.7 s
102.74 s
7.44 5
92.74 5


Answer 1

45.7 s

Explanation:

Darya:

Number of laps = 13

Average time per lap = 23.5 seconds

Total time to swim 13 laps = Number of laps × Average time per lap

= 13 × 23.5

= 305.5 seconds

Kana:

Number of laps = 10

Average time per lap = 25.98 seconds

Total time to swim 10 laps = Number of laps × Average time per lap

= 10 × 25.98

= 259.8 seconds

It took longer for Darya to swim

13 laps than for Kana to swim 10 laps.

How much longer?

= 305.5 seconds - 259.8 seconds

= 45.7 seconds