Three pipes A, B and C can fill a cistern in 8 minutes,12 minutes and 16 minutes respectively. What is the time taken by three pipes to fill the cistern when they are opened together?

3.7 Min

The following chart has to be made first:

Efficiency of A = 6

Efficiency of B = 4

Efficiency of C = 3

Efficiency of A + B + C = 13

Thus, all the 3 pipes can fill the cistern in 3.7 minutes = \(\frac{ 48}{13 }\) = 3.7 minutes