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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

Read Explanation:

xy/(x+y) = (20 x 30)/(20 + 30) =600/50 =12 minutes.


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