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guajiro [1.7K]
3 years ago
6

One pump fills a tank in 20 hours and another in 15 hours. When a third pump is added the tank fills in 6 hours. Find out how lo

ng it takes the 3rd pump to fill the tank alone.
Mathematics
1 answer:
mrs_skeptik [129]3 years ago
4 0
Every hour, the first pump fills 1/20 of the tank, and the second fills 1/15 of the tank.  If, when combined with the third pump, all three pumps fill 1/6 of the tank in an hour, the third pump fills 1/6-1/15-1/20=\frac{1}{20} of the tank every hour, so it takes a total of 20 hours to fill the tank alone.
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