Question 353826
One can fill a tank in 4 hours. Together with a second pipe, the tank can be filled in 3 hours. How long would it take the second pipe alone to fill the tank?
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Let x = time (hours) for second pipe to fill alone
then
3(1/4 + 1/x) = 1
multiplying both sides by 4x:
3(x + 4) = 4x
3x + 12 = 4x
12 hours = x