Question

Please answer my question.

Answer 1

Answer:

2 hours

Step-by-step explanation:

One pipe takes 6 hours to empty the tank. So let's name this pipe "pipe 1".

Fraction of tank emptied by pipe 1 in 1 hour = 1/6

Another pipe takes 3 hours to empty the same tank. So let's name this pipe "pipe 2"

Fraction of tank emptied by pipe 2 in 1 hour = 1/3

So fraction of tank emptied by both pipe 1 and 2 in 1 hour = 1/6 + 1/3

                                                                                                  = 1 + 2/6

                                                                                                   = 3/6 = 1/2

Therefore, time taken to empty the whole tank = 1/2 / 1 = 2 hours

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