PracticeMedium
Q.Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both pipes are opened together, at what time should pipe B be turned off so that the tank is filled in 15 minutes?
a
5 min
b
7.5 min
c
8 min
d
10 min
Correct Answer: Option B
The correct solution involves applying the fundamental concept to derive the final value step by step...