Question:
If two pipes can fill a tank in 20 minutes & 30 minutes respectively. If both the pipes are opened simultaneously, then the tank will be filled in
A10 minutes
B15 minutes
C12 minutes
D18 minutes
Answer:
C. 12 minutes
Explanation:
xy/(x+y) = (20 x 30)/(20 + 30) =600/50 =12 minutes.