Solve the Problem $10 \mathrm{hr}$ One of the Pipes, Used Alone, Takes

Multiple Choice

Solve the problem. Round your answer to the nearest tenth, if necessary.
-Two pipes together can fill a large tank in $10 \mathrm{hr}$ . One of the pipes, used alone, takes $15 \mathrm{hr}$ longer than the other to fill the tank. How long would each pipe take to fill the tank alone?

A) $12.5 \mathrm{hr} ; 27.5 \mathrm{hr}$
B) $10 \mathrm{hr} ; 25 \mathrm{hr}$
C) $25 \mathrm{hr} ; 40 \mathrm{hr}$
D) $15 \mathrm{hr} ; 30 \mathrm{hr}$