Question 183276
 grace starts jogging home at 5 km/hr. will leaves 10 minutes later on a bike (from the same place) riding at 15 km/hr. how long will it take will to catch up to grace?
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In 10 minutes, Grace is 5/6 km away.
Will is traveling 10 km/hr wrt (with respect to) Grace.
They will converge in (5/6)/10 hours = 5/60 hours
= 5 minutes.
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PS  stanbon got it right until he said 1/12 hour is 6 minutes.
1/12 hour = 5 minutes.