Question

Joe's heart beats 70 beats per minute. a) How many times will his heartbeat in 20 years? Ignore leap years. b) If Joe's heart beats 1,200,703 times, how much has elapsed?

Answer 1

An hour has 60 minutes, then there are

`1\cdot60=60`

minutes in an hour. A day has 24 hours, then there are:

`24\cdot60=1440`

minutes in a day. A year has 365 days then there are:

`365\cdot1440=525600`

minutes in a year.

a)

Once we know how many minutes are in a year we can calculate how many beats there are in 20 years; to do this we multiply the number of years by the minutes in a year and by the beats per minute:

`525600\cdot20\cdot70=735,840,000`

Therefore, there are 735,840,000 beats in 20 years.

b)

To find how much time has elapsed we divided the number of beats by the beats per minutes.

`(1200703)/(70)=17,152.9`

Then, it has elapsed 17,152.9 minutes.