Question
A walks at 4 kmph and 4 hours after his start , B cycles start him at 10 mph. how far from the start does B catch up with A ?
Answer: Option D
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Suppose after `x` km from the start B catch up with A. Then the difference in the time taken by A to cover `x` km and that taken by B to cover `x` km is 4 hours.
`:.` ` x/4 - x/10 = 4 or x = 26.7` km.
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