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Pipes and Cistern - General Aptitude

Q1:

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?

A 12 min.

B 15 min.

C 25 min.

D 50 min.

ANS:A - 12 min.

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 + 1 = 1 .
20 30 12
Both pipes can fill the tank in 12 minutes.