2 maths exercises

kristo · #1 Feb 26, 2007, 10:19 AM

1. A pipe fills a pool in 4 hours, another pipe drains a full pool in 6 hours. How long will it take to fill the pool if both pipes are opened?

2. A pool is connected with 3 pipes. Two pipes fill the pool and one drains it. It takes 3 hours for first pipe to fill the pool and 2 hours for the 2nd one. The third pipe drains a full pool in 6 hours. How long will it take to fill the pool if all pipes are opened?

Ugh, they seem so simple lol, but I can't solve them, just a few guidelines would help..
I'm off to sleep now, so thanks to anyone who helps.

kristo · Feb 27, 2007, 02:58 AM

Thanks!
So is it 12h for the first one and 1.5h for the 2nd exercise?



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