If three pipes A, B and C in which only C is outlet pipe can fill a tank in \(\frac{102}{5}\) hours. If pipe A and B can fill it in 17 and 15 hours respectively, then the time taken by C to empty the tank is?

34 68 13 32

34

Efficiency of A + B - C = 5 ⇒ (6 + 2) - C = 5 ⇒ Efficiency of C = 3 Time taken by C = \(\frac{102}{3}\) = 34 hours