Thursday
July 24, 2014

Homework Help: algebra word problem

Posted by christy on Tuesday, August 24, 2010 at 12:24am.

During the first part of a trip a canoeist travels 55 miles at a certain speed the canoeist travels 15miles on the second part of the trip, 5 miles per hour slower. The total time for the trip is 4hours. What was the speed on each part of the trip.
This is what I have so far, then I am lost
t1= 55/r t2=15/r-5 =4
r (r-5) (55/r + 15/r-5) =4
55 (r-5) +15r=4r (r-5)
55r-275 + 15r=4r^2-20r
Now I am lost.

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