Posted by Anne on Sunday, October 9, 2011 at 9:04pm.
rate = job/time
let the time of the faster pump be t min
let the time of slower pump be 3t min
rate of slower = job/(3t)
rate of faster = job/t
combined rate = job/(3t) + job/t
= (job + 3job)/(3t) = 4job/(3t)
time working together = job/(4job/3t)) = 45
job(3t)/(4job) = 45
3t/4= 45
t = 60
Using only the first pump would require 60 minutes.
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