SOLUTION: tim drove 140 miles in 2 hours. if he increased his speed by 10 miles per hour on the trip home how much quicker was the trip

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Question 344839: tim drove 140 miles in 2 hours. if he increased his speed by 10 miles per hour on the trip home how much quicker was the trip
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Hi,
r*t = d
Let r be the speed going out.
r*2hr =140mi
r=70 mi/hr
.
Increase r by 10 mi/hr
r= 80
Let t be the time it takes to get home
80t = 140
t = 1 3/4 hr
15 minutes quicker on the way home