SOLUTION: Over a distance of 120 km , the average speed of a train 40 kmh faster than the speed of a car. If The train covers the distance in 30 minutes less time , find the speed of The tr

Question 1153877: Over a distance of 120 km , the average speed of a train 40 kmh faster than the speed of a car. If The train covers the distance in 30 minutes less time , find the speed of The train?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!

                   SPEED         TIME           DISTANCE

TRAIN              r+40          120/(r+40)       120

CAR                r             120/r            120

DIFFERENCE

Thirty minutes is one-half hour.

The train's time is less than car's time by half hour.
.
Solve for r+40.
(But can be arranged differently.)
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