SOLUTION: Sally was able to drive an average of 20 miles per hour faster in her car after the traffic cleared. She drove 16 miles in traffic before it cleared and then drove another 108 mile

Question 1103576: Sally was able to drive an average of 20 miles per hour faster in her car after the traffic cleared. She drove 16 miles in traffic before it cleared and then drove another 108 miles. If the total trip took 4 hours, then what was her average speed in traffic?
Answer by josgarithmetic(39631) (Show Source): You can put this solution on YOUR website!

            SPEED     TIME          DISTANCE

TRAFFIC        r       16/r           16

CLEAR         r+20     108/(r+20)     108

Total                    4

-
------Solve for r.
.
.
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