d1 + d2 = 200.
20mi/h * 2h + r*2 = 200
40 + 2r = 200
r = 80 mi/h.
Two cars start at the same time but travel in opposite directions. One car avaerage speed was 20mph at the end of 2 hours the two cars are 200 miles apart. Find the avatars speed in mph of the other car.
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