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 it will take to fill the tank ?

Two pipes A and B can fill a tank in 20 and 30 minutes respectively. I

1.	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 it will take to fill the tank ?
A.	10 mins
B.	12 mins
C.	15 mins
D.	20 mins
Answer» C. 15 mins

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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 it will take to fill the tank ?

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