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 inA10 minB12 minC5 minD8 minAnswer: 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 minRead more in App