A rectangular tank can hold 36 liters of water. tap X takes 9 minutes to fill up the tank and tap Y takes 3 minutes longer than than tap X to fill up the tank. how long will they take to fill up the tank if both taps are turned on at the same time ?
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Answer:
time taken by x=9 min
time taken by y=9+3
=12 min
time taken by x in 1 min=1/9
time taken by y in 1min=1/12
work done by both of them in 1 min=1/9+1/12
=7/36
hole work done=36/7
capacity of tank=36
tank filled by them both=36/36/7
=36/36*7
your answer is 7 minutes
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