Question

Two cars start at the same time, but travel in opposite directions. One car's average speed is 20 miles per hour (mph). At the end of 2 hours, the two cars are 120 miles apart. Find the

average speed in mph of the other car. (Enter an exact number.)
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Answer 1

The first car's speed is 40 mph. 2 hours at that rate equals 80 miles. So:

140-80=60

60 miles/2 hours=30 mph as the rate of the second car.

Explanation: