Question

In a water refilling stationthe time that a pipe takes to fill a tank is 10 minutes more than the time that another pipe takes to fill the same tank. If the two . If the two pipes are open at the same time, they can fill the tank in 12 minutes. How many minutes does each pipe take to fill the tank?

Answer 1

If the faster pipe takes x minutes, then we have

1/x + 1/(x+10) = 1/12
x = 20

So, the pipes take 20 and 30 minutes, respectively.