There are 4 filling pipes and 3 emptying pipes capable of filling and emptying in 12 minutes and 15 minutes respectively. If all the pipes are opened together and as a result, they fill 10 litres of water per minute. Find the capacity of the tank.
A
65 ltr
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B
70 ltr
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C
75 ltr
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D
80 ltr
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E
None of these
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Solution
The correct option is C 75 ltr (412−315)×t=1 t=152 minute- in this time the tank will be filled. So the capacity =152×10=75litre