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A man covered a certain distance at some speed. Had he moved 3 kmph faster, he would have taken 40 minutes less. If he had moved 2 kmph slower, he would have taken 40 minutes more. The distance (in km) is:

A. 35

B. 3623

C. 3712

D. 40

Please do not use chat terms. Example: avoid using "grt" instead of "great".