SOLUTION: Working together, two pumps can drain a certain pool in 5 hours. If it takes the older pump 15 hours to drain the pool by itself, how long will it take the newer pump to drain the
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-> SOLUTION: Working together, two pumps can drain a certain pool in 5 hours. If it takes the older pump 15 hours to drain the pool by itself, how long will it take the newer pump to drain the
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Question 250056: Working together, two pumps can drain a certain pool in 5 hours. If it takes the older pump 15 hours to drain the pool by itself, how long will it take the newer pump to drain the pool on its own? Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! Working together, two pumps can drain a certain pool in 5 hours.
If it takes the older pump 15 hours to drain the pool by itself,
how long will it take the newer pump to drain the pool on its own?
:
you can do this in your head but here is an algebra equation way
:
Let t = time required by new pump to drain the pool
:
Let the completed job (drained pool) = 1
: + = 1
Multiply by 15t
t(5) + 15(5) = 15
5t + 75 = 15t
75 = 15t - 5t
75 = 10t
t = 75/10
t = 7.5 hrs new pump alone
;
:
Check this
5/15 + 5/7.5 =
.33 + .67 = 1
