SOLUTION: Jim drove the 120 miles to Grandmother's house in 3 hours. He increased his speed by 10 miles per hour on the way home. How long did it take him to drive home?

SOLUTION: Jim drove the 120 miles to Grandmother's house in 3 hours. He increased his speed by 10 miles per hour on the way home. How long did it take him to drive home?

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Question 905887: Jim drove the 120 miles to Grandmother's house in 3 hours. He increased his speed by 10 miles per hour on the way home. How long did it take him to drive home?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Find the speed he drove on the way there.
d = r*t
r = d/t
------
Add 10 to it.
d = r*t
t = d/r
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