Given :
Number of heart beat in 1 minute , n = 70 .
The individual lives for 85 years .
To Find :
The number of heartbeats in their lifespan .
Solution :
Now , number of minutes in one hour is 60 .
One day contains 24 hours .
Therefore , minutes in one whole day :

Now , 1 year contains 365 days .
( Note : We are not considering any leap years )
Minutes in one year are :

So ,total minutes in 85 years is :

Hence , this is the required solution .