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# The inlet pipe can fill the empty swimming pool in 8 hours,

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Director
Joined: 13 Nov 2003
Posts: 971
Location: Florida
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The inlet pipe can fill the empty swimming pool in 8 hours, [#permalink]  03 Dec 2003, 17:44
The inlet pipe can fill the empty swimming pool in 8 hours, while the outlet pipe can empty the pool from full capacity in 12 hours. if both pipes are opened when the tank is 25% full, how many hours from there does it take for the tank to fill to 90% capacity ?

I am getting 16.2hrs, but that's not the answer. don't know what am I missing... SOS
Manager
Joined: 22 Apr 2003
Posts: 180
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Kudos [?]: 8 [0], given: 0

Re: empty pool [#permalink]  03 Dec 2003, 18:27
dj wrote:
The inlet pipe can fill the empty swimming pool in 8 hours, while the outlet pipe can empty the pool from full capacity in 12 hours. if both pipes are opened when the tank is 25% full, how many hours from there does it take for the tank to fill to 90% capacity ?

I am getting 16.2hrs, but that's not the answer. don't know what am I missing... SOS

3.12 hours, right?
Senior Manager
Joined: 11 Nov 2003
Posts: 355
Location: Illinois
Followers: 1

Kudos [?]: 0 [0], given: 0

15.6 hors?

1/8 - 1/12 = 1/T => T = 24 HOURS to fill up the tank fully.

We need to fill the tank from 25 % to 90 % so only 65% of the tank capacity.

That will take 0.65 x 24 = 15.6 hours

Director
Joined: 13 Nov 2003
Posts: 971
Location: Florida
Followers: 1

Kudos [?]: 33 [0], given: 0

gmatblast wrote:
15.6 hors?

1/8 - 1/12 = 1/T => T = 24 HOURS to fill up the tank fully.

We need to fill the tank from 25 % to 90 % so only 65% of the tank capacity.

That will take 0.65 x 24 = 15.6 hours

you got that right..!
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