Pipe A can fill a tank in 45 hours and pipe B can empty it in 36 hours . If both the pipes are opened in the empty tank, in how many hours will it be full ?
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Answer: 20 hours
Step-by-step explanation:
Tap A = 1/45 and Tap B = 1/36
Total work done is A+B = 1/45+1/36 = 1/9(1/5+1/4) =1/20
Then the empty tank filled in 20 hours
Step-by-step explanation:
Tap A = 1/45 and Tap B = 1/36
Total work done is A+B = 1/45+1/36 = 1/9(1/5+1/4) =1/20
Then the empty tank filled in 20 hours
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