Question

Anthony practices swimming by completing 10 laps every day. Every Time he practices he improved his time by 3 seconds. If it took Anthony 20 minutes to complete 10 laps 1 week ago, what is his time today?

Answer 1

19 minutes 39 seconds

Explanation:

In 7 days, Anthony has improved his time by ...

7 × 3 seconds = 21 seconds

The time that is 21 seconds shorter than 20 minutes is 19 minutes 39 seconds.

Anthony's time today is 19:39 minutes:seconds.

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You are expected to know that there are 60 seconds in a minute.