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Billy-Joe and Bob purchased a pool with a capacity of 60 gallons for his farm. One day, at 1 p.m., Billy-Joe placed a hose into the pool, filling it with water at a rate of 3 gal per hour. After 10 hours, horses and cows started drinking the water at a combined rate of 1 gal/hr. Five hours later, Bob noticed the animals drinking and placed a second hose in the pool which filled it at a rate of 2 gal/hr. At what time could Bob declare the pool was full of water?
Sagot :
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