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2015-06-20T11:38:44+05:30

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Total time duration in consideration : 2 min 40 secs = 160 secs

No of complete rounds in this time = 160/40 = 4 rounds

Therefore he will be exactly at the point where he started. Hence his displacement will be 0, although he will cover a distance of 4 (2πR)
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2015-06-20T14:28:44+05:30

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2 min 20 second = 140 second.
he completed one round in 40 second.
in 140 second, he will cover= 140/40=3.5 round.
after 3.5 round, he would be on the opposite side of the starting point.
So the displacement will be the diameter or 2R.
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