Question

Your pump empties the water from a swimming pool in 6 hours. When your friend's pump is used together with your pump, the pool is emptied in 1.5 hours. How long (in hours) does it take your friend's pump to empty the pool when working alone? Hour(s)

Answer 1

(I'm sorry if this is wrong, I'm bad at math but this one was pretty simple really) 6-1.5=4.5

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