SOLUTION: Hi, I'm terrible at math word problems. Can you answer this? With work shown? Ok so there at two pipes to the bathtub. You turn the first pipe on and the bathtub fills in 5 m

Question 906027: Hi, I'm terrible at math word problems. Can you answer this? With work shown?
Ok so there at two pipes to the bathtub. You turn the first pipe on and the bathtub fills in 5 mins. You empty the bathtub. The you turn pipe number 2 on and it takes 7 mins to fill up. Then you empty the bathtub and turn both pipes on. How long does it take to fill up the bathtub? I need to know buy 12:00 tonight please.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
there at two pipes to the bathtub. You turn the first pipe on and the bathtub fills in 5 mins. You empty the bathtub. The you turn pipe number 2 on and it takes 7 mins to fill up. Then you empty the bathtub and turn both pipes on. How long does it take to fill up the bathtub?
----------------
The 1st pipe fills 1/5 of the tub per minute
The 2nd pipe fills 1/7 of the tub per minute
---------------
Together, they fill 1/5 + 1/7 = 12/35 per minute
--> 35/12 minutes/tub

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