Question

A tank is filled with water. In first hour 10 liters, second hours 20 liters, and third hour 40 liters and so onif time taken to fill of the tank if 5 hours. What is the time taken to fill up the tank?

Answer 1

Answer:

7 hours

Step-by-step explanation:

At the end of each hour, amount of water gets doubled

At the end of 5th hour 1/4 of the tank is filled

At the end of 6th hour 1/4×2=1/2 of the tank is filled

At the end of 7th hour 1/2×2=1 tank is filled

i.e., 7 hours are required to fill up the tank