Question

Pipe a can fill a tank in 6 hours and pipe b fills a tank in 10 hours and pipe c can fill it in in 18 hours. how long will it take them to fill the tank together

A. 9 hours
B. 18 hours
C. 20 hours
D. 20 1/2 hours

Answer 1

The 3 pipes working together will fill a tank in T = 3.10 hours

How long will it take them to fill the tank together?

We know that:

Pipe A takes 6 hours.

Pipe B takes 10 hours.

Pipe C takes 18 hours.

Then the total time it would take to fill a tank if the 3 pipes work together is given by T in the equation:

(1/6 + 1/10 + 1/18)*T = 1

T = 1/(1/6 + 1/10 + 1/18)

T = 3.10 hours.