SOLUTION: How do I figure this problem out? The hot water faucet can fill the pool in 30mins and the cold water faucet can fill the pool in 20mins. How long would not take to fill the poo

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Question 874306: How do I figure this problem out?
The hot water faucet can fill the pool in 30mins and the cold water faucet can fill the pool in 20mins. How long would not take to fill the pool with both the hot and cold water faucets on?
A. 11 1/5 min
B. 15 4/5 mins
C. 14mins
D. 12 mins
Found 2 solutions by josgarithmetic, richwmiller:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Hot, 1/30 pools per minute;
Cold, 1/20 pools per minute.

HOW LONG if hot and cold fill at the same time?
highlight%281%2F%281%2F30%2B1%2F20%29%29 minutes.

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1/30+1/20=1/x
1/3+1/2=10/x
2/6+3/6=10/x
5/6=10/x
5x=60
x=12
D)