Question

Pipe A can fill a tank in 5 hours and the pipe b can fill the same tank in 4 hours , if both pipes are closed at the same time when will the tank be full??

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Answer 1

Answer:

pipe a can fill a tank in 5 hours

pipe a can fill a tank in 1/5 hours

pipe b can fill a tank in 4 hours

pipe b can fill a tank in 1/4 hours

both pipes can fill a tank in = ( 1/4) + (1/5) = 9 upon

20

so both the pipes can fill a tank in 20/9=2.22 hours