Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank ?

– by 0

A. 25 min
B. 50 min
C. 12 min
D. 15 min

Explanation:

Part filled by A in 1 min. = 1/20

Part filled by B in 1 min. = 1/30
part filled by (A + B) in 1 min. = 1/20 + 1/30 = 1/12.
Both the pipes can fill the tank in 12 minutes.

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