A pipe can fill a tank in 30 min B can fill in 28 min then if 3/4 th of tank can be filled by B pipe and after wards both are opened then how much time is required by both the pipes to fill the tank completely.

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A pipe can fill a tank in 30 min B can fill in 28 min then if 3/4 th of tank can be filled by B pipe and after wards both are opened then how much time is required by both the pipes to fill the tank completely.

Anonymous Answered question December 25, 2022

105/29 mins

24.6 min (not sure)

24 min

1 minute B can fill 1/28 part of tank
1 minute A can fill 1/30 part of tank
So 3/4 part of tank can be filled in 28(3/4) time by B = 21 minutes
In 1minute both the pipe can fill (1/28 + 1/30) part of tank ,so 1/4 the part can be filled in (28*30/58 )*1/4 =3.6
So total time =21+3.6=24

Aprox. 4.6 min if both opened simultaneously

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I got 14.5min

Admin Changed status to publish November 8, 2022
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