Pipe A can fill in 20 minutes and Pipe B in 30 mins
and Pipe C can
empty the same in 40 mins.If all of them work
together, find the time
taken to fill the tank

Answers were Sorted based on User's Feedback



Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If al..

Answer / jayashree

1/20 +1/30 -1/40

30+20/600 -1/40

1/12 -1/40

7/120

then d answer ll be 120/7 this can be returns as 17 1/7mins

Is This Answer Correct ?    55 Yes 2 No

Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If al..

Answer / vishnu chaitanya g

120/7

Is This Answer Correct ?    34 Yes 1 No

Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If al..

Answer / ravi savaliya

a fill - 1/20 per minute
b fill - 1/30 per minute
c can empty - 1/40 per minute


Suppose this take x minute

1 x +1x - 1x
--- -- ---- =1
20 30 40

Solve this x=17(approximately)

Is This Answer Correct ?    29 Yes 8 No

Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If al..

Answer / vishnu gupthan nair

Volume = Gallons/Minute x Minutes ==> V = Rt
V = 20a = 30b = 40c

Express a and b in terms of c:

a = 2c

b = 4c/3

With all pipes open, the fill rate becomes:

R = a+b-c

R = 2c+4c/3-c

R = 7c/3

Time required is Volume / Fill Rate:

t = V/R

t = 40c/(7c/3)

t = 120/7

t = 17.14 minutes

Is This Answer Correct ?    15 Yes 2 No

Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If al..

Answer / daniel

If the pipes work together, the fill pipes are open, and the
"empty" pipe is closed.
So, it will take about 8.3 minutes to fill the tank.

Is This Answer Correct ?    14 Yes 2 No

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