If 1 / 2 of a tank is filled in 1 / 4 hour, how long will it take to fill the tank completely?
Q1. If 1 / 2 of a tank is filled in 1 / 4 hour, how long will it take to fill the tank completely?
Answer: 1 / 2 hour
Explanation: If 1/2 tank is filled in 1/4 hour, then the whole tank will be filled in 2 * (1/4) = 1/2 hour.