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Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank? ?->(Show Answer!)
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1. Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?





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  • By: guest on 01 Jun 2017 05.47 pm
    Part filled in 4 minutes = 4 1 + 1 = 7 . 15 20 15 Remaining part = 1 - 7 = 8 . 15 15 Part filled by B in 1 minute = 1 20 1 : 8 :: 1 : x 20 15 x = 8 x 1 x 20 = 10 2 min = 10 min. 40 sec. 15 3 The tank will be full in (4 min. + 10 min. + 40 sec.) = 14 min. 40 sec.
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