Question

two inlet pipes a and b can fill an Empty cistern in 4 hours and 8 hours respectively if both are opened together in the empty cistern how much time will it take to fill it completely​

Answer 1

Answer:

2 hours, 40 minutes

Step-by-step explanation:

multiply a by 2 to reach the common time unit of 8 hours. This means that in 8 hours, a can fill 2 tanks while b can fill 1 tank giving us a total of 3 tanks being filled every 8 hours.

To get to one tank, divide by three and we get 1 tank filled in 2 and 2/3 hours or 2 hours and 40 minutes.