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The sum of two distances is 404 miles:
r*4 + (r+1)*4 = 404,
where " r " is the rate of slower car.
r + (r+1) = 101
2r + 1 = 101
2r = 101 - 1 = 100 ====> r = 50.
Answer. 50 mph and 51 mph.
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