Question

The average human heart beats at 72 times per min. How many times does it beat in 15 seconds? How many in an hour? How many in a day?

Answer 1

18 times in 15 seconds
4320 times in an hour
103680 times in a day

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Answer 2

in 1 min(60 secs)=72 times

in 15 sec=(72/60)*15

            =18 times

in 1 hour(60 mins)=72*60

                         =4320 times

in 1 day(1440 mins)=1440*72

                            =103680 times