Pipe science
A water tank is filled by two pipes in 48 minutes. If the larger pipe alone can fill it in 40 minutes less time than the smaller pipe, find the time it takes for the smaller pipe to fill the tank alone.
Note: time is to be stated in "hours"
The answer is 2.
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Let x=# of min for the smaller pipe and x - 40 = # of min for the larger then
48/x + 48/(x-40) = 1
Solve for x we get 120 which is 2 hours.