Two cyclists start together on a 2 km circular track and ride in opposite directions at 12 km/h and 18 km/h. How many times will they meet in the first hour?
Correct answer B. 15
Explanation
Relative speed = 30 km/h, so they meet every 2/30 hour = 4 minutes. In 60 minutes they meet 60 / 4 = 15 times.
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