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2015-06-20T11:42:09+05:30

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Total time duration in consideration : 2 min 20 secs = 140 secs

No of complete rounds in this time = 140/40 = 3 rounds

After these 3 rounds, he will be exactly at the point where he started. Hence his displacement will be 0, although he would have covered a distance of 3 (2πR)

Now in the next 20 secs, he will have covered half the circular track (assuming he travels at a uniform speed), So his dipslacement will be 
2 \times r (he will be diametrically opposite to where he started from and displacement is the shortest distance between initial and final positions)
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2015-06-20T14:30:58+05:30

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After 140 second, he will be on the diametrically opposite point of starting point. so displacement is the diameter or 2R.
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