The drain can empty the water from a full sink in 3 minutes. If the water is running while the drain is open, it takes 8 minutes to empty a full sink. How long would it take to fill an empty sink with the drain closed?

1 Answer
Karis Y.
May 6, 2017

#4 4/5# minutes

Explanation:

Drain open tap closed 1 minute - 1/3 sink

Drain open tap opened 1 minute - 1/8 sink

Drain closed tap opened 1 minute - 1/3 - 1/8
= 8/24 - 3/24
= 5/24

If it fills up 5/24 of the sink in 1 minute then it would take 24/5 minutes to fill the whole sink which is #4 4/5#minutes

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