A water storage tank has two drains. It can be shown that the time it takes to empty the tank if both drains are open is given by the formula (1)/((1)/(a)+(1)/(b)) where a= time it takes for the first drain to empty the tank, and b=time for the second drain to empty the tank. a. Simplify this complex fraction.   _____ b. Find the amount of time needed to empty the tank using both drains if, used alone, the first drain empties the tank in 7 hours and the second drain can empty the tank in 6 hours. It takes ____  hours to empty the tank.

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