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Three pipes can fill a tank in 12 min, 15min, 20 min respectively. If all the three pipes are opened sumultaneously then the tank will be filled in

A10 min

B12 min

C5 min

D8 min

Answer:

C. 5 min

Read Explanation:

xyz /(xy+xz+yz) = (12 x 15 x 20) / (12 x 15 + 12 x 20 + 15 x 20) =(12 x 15 x 20) /(180 + 240 + 300) =(12 x 15 x 20)/720 = 5 min


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