crabtree071515 crabtree071515

26-04-2017
Mathematics

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An inlet pipe on a swimming Pool can be used to fill the pool in 36 hours. The drainpipe can be used to empty the pool in 40 hours. If the pool is 2/3 filled using the inlet pipe and then the drainpipe is accidentally opened, how long from that time will it take to fill the pool?

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Аноним Аноним

26-04-2017

So 2/3 of 36 is 24. So 24 that were filled and 2/3 of 40 is 80/3 which equals 26 2/3 to drain it. And then to fill the pool would be 36 hours. What's so hard...

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