At a constant rate of flow, it takes 20 minutes to fill a swimming pool if a large hose is used and 30 minutes if a small hose i
s used.
At these constant rates, how many minutes will it take to fill the pool when both hoses are used simultaneously?
A) 10 B) 12 C) 15 D) 25 E) 50
1 answer:
Answer:
B
Step-by-step explanation:
Firstly, let’s say they are to fill a total of x liters, rate for big hose would be x/20 while for small hose it would be x/30.
Now if they are to work combined, total time would be
x/20 + x/30 = 5x/60 = x/12
Hence, it will take them 12 minutes
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