Cycling at 12 km/h, a student is 8 minutes late for college; cycling at 15 km/h, he is 4 minutes early. How far is the college?
Correct answer C. 12 km
Explanation
Time difference = 8 + 4 = 12 minutes = 1/5 hour. d/12 − d/15 = 1/5 gives d/60 = 1/5, so d = 12 km.
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