SOLUTION: Joe leaves on a car trip,driving a steady 45 mph. He expects the trip to take exactly 3 hours. After he has been driving for an hour, he realizes he has forgotten an appointment, a

Question 967014: Joe leaves on a car trip,driving a steady 45 mph. He expects the trip to take exactly 3 hours. After he has been driving for an hour, he realizes he has forgotten an appointment, and he needs to arrive a half hour earlier than planned. How many miles per hour will he need to drive for the rest of the trip to make his goal?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!

The distance he needs to drive must
be 135 mi
--------------
In hr, he drives

mi
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The remaining distance he has to drive is:

-----------------
He planned to drive for more hrs
He wants to drive for hrs

------------
He will need to drive mi/hr to
arrive 1/2 hr early

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