jogger's observation
Consider two cities P and Q between which consistent bus service is available in both directions every x minute. A morning jogger is jogging towards Q from P with a speed of 10km/hr. Every 18 min a bus crosses this jogger in its own direction of motion and every 6 min another bus crosses in the opposite direction. What is the time period(in minutes) between two consecutive buses?
The answer is 9.
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