Two men starting from the same place walk at the rate of 5 kmph and 5.5 kmph respectively. What time will they take to be 8.5 km apart, if they walk in the same direction?
Relative speed = 0.5km/hr
to be 0.5 km apart, they take 1 hour.
To be 8.5 km apart, they take [1/0.5 * 8.5] hrs = 17 hrs.
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