SOLUTION: one pipe can fill a swimming pool in 15 hours, a second pipe requires 18 hours. If the first pipe is opened for 7 hours and then closed when the second pipe is opened, how long wil
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-> SOLUTION: one pipe can fill a swimming pool in 15 hours, a second pipe requires 18 hours. If the first pipe is opened for 7 hours and then closed when the second pipe is opened, how long wil
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Question 791864: one pipe can fill a swimming pool in 15 hours, a second pipe requires 18 hours. If the first pipe is opened for 7 hours and then closed when the second pipe is opened, how long will it take the second to finish filling the pool? Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! one pipe can fill a swimming pool in 15 hours, a second pipe requires 18 hours.
If the first pipe is opened for 7 hours and then closed when the second pipe is opened, how long will it take the second to finish filling the pool?
:
Let t = time for the 2nd pipe to finish filling the pool
Let the full pool = 1 + = 1
multiply by the LCM of 15 and 18, that's 90, results:
90* + 90* = 90(1)
cancel the denominators
6(7) + 5t = 90
5t = 90 - 42
5t = 48
t = 48/5
t = 9.6 hrs
