At a constant Rate of flow, it takes 10 minutes to fill a swimming pool if a large hose is used and 15 minutes if a small hose is Used. At these constant rates, how many minutes will it take to fill the pool when both hoses are used simultaneously? Choose one:
A) 6
B) 12
C) 15
D) 25
E) 50
time taken to fill the pool by Large Hose =10 minutes =L or 1/L=1/10 similarly 1/S=1/15   simultaneously it will take 1/L+1/S=1/10+1/15=5/30=6 minutes   6nswer : 6
<result>A</result>
At a constant Rate of flow, it takes 10 minutes to fill a swimming pool if a large hose is used and 15 minutes if a small hose is Used. At these constant rates, how many minutes will it take to fill the pool when both hoses are used simultaneously?