Problema Solution
a winery has a vat with two pipes leading to it. the inlet pipe can fill the vat 7 hours, while the outlet pipe can empty it in 9 hours. how long will it take to fill the vat if both pipes are left open?
Answer provided by our tutors
let 'x' be the hours needed for the vat to fill when both pipes are open
1/7 - 1/9 = 1/x
by solving we find
x = 31.5 h
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if both pipes are open the vat will fill in 31.5 hours.