Question

the heart of a person beat 72 times per minute find the number of heart beats in 2 hours.
option
a) 8640
b) 8654
c) 8460
​

Answer 1

a) 8640

Now, we know that there are 60 minutes in one hour. So if we have to count the heart beats in one hour, we will add 72 heart beats per minute for 60 times. So, we can write this as 72 multiplied with 60 instead of adding 72 for 60 times. So, heart beats in 60 minutes or one hour = 72×60=4320 × 2 (2hours) = 8640

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