Two tap p and q can fill a pool in 6 hoursand 9 hours respectively third tap r can empty the pool in 12 hours how long will it take to fill the pool if all the three taps are opened together
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Answer:
36/7 hours
Step-by-step explanation:
Tank filled in 1 hour by tap P = 1/6
Tank filled in 1 hour by tap Q = 1/9
Tank emptied in 1 hour by tap R = 1/12
Tank filled in 1 hour = 1/6 + 1/9 - 1/12
= 7/36
Total time to fill the tank is 36/7 hours
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