SOLUTION: A tank can be emptied thru either of 2 pipes, the 1st pipe empties the tank in 4hours. The 2nd pipe empties in 3hours. how long will it take to emptythe tank using both pipes

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Question 85282: A tank can be emptied thru either of 2 pipes, the 1st pipe empties the tank in 4hours. The 2nd pipe empties in 3hours. how long will it take to emptythe tank using both pipes
Found 2 solutions by stanbon, Lacey020991:
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
A tank can be emptied thru either of 2 pipes, the 1st pipe empties the tank in 4hours. The 2nd pipe empties in 3hours. how long will it take to emptythe tank using both pipes
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1st Pipe DATA:
Time = 4 hours/job ; Rate = 1/4 job/hr
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2nd Pipe DATA:
Time = 3 hours/job ; Rate = 1/3 job/hr
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Together DATA;
Time = x hours/job ; Rate = 1/x job/hr
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EQUATION:
rate + rate = together rate
1/4 + 1/3 =1/x
7/12 = 1/x
x= 12/7 = 1 hr (5/7)*60 minutes
x = 1 hr 42.86 minutes ( Time to empty the tank if both pipes are open)
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Cheers,
Stan H.

Answer by Lacey020991(49) (Show Source):
You can put this solution on YOUR website!