Question

John loves to swim and can complete 10 laps in 4 minutes. How long would it take him to swim 25 laps?​

Answer 1

10 minutes

Explanation:

You can use a proportion.

10 laps is to 4 minutes as 25 laps is to x minutes.

10/4 = 25/x

Reduce the left fraction.

5/2 = 25/x

Cross multiply.

5x = 50

x = 10

Answer: 10 minutes

Answer 2

62.5 minutes

Explanation:

10 divided by 4

then 2.5 times 25 gives the answer