Question

A water tank can be filled by pipe p alone in 30 mins and pipe q alone in 40 mins the same tank cam be emptied by pipe r alone in 25 mins if three pipes are opened together. How much time take to fill the tank
A) 62.45
B) 54.55
C) none of these
D) 58mins

Answer 1

Answer:

c. is the correct answer for your question