Given :
Ruben put an empty cup underneath a leaking faucet.
After 1 ½ hours, Ruben had collected ¼ cup of water.
To Find :
The rate, in cups per hour, at which the water is leaking from the faucet.
Solution :
Rate in which cup is filling with water.
[tex]R=\dfrac{Portion\ of \ water \ filled }{Time\ taken}\\\\R = \dfrac{\dfrac{1}{4}}{1\dfrac{1}{2}}\\\\R= \dfrac{1\times 2}{4\times 3}\\\\R = 0.167 \ cup/hour[/tex]
Therefore, the rate is 0.167 cup/hour.