Discussion

Explanation:

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Let r be the radius of the circular tracks.

Length and breadth of the rectangular track are 4r and 2r respectively.

Length (perimeter) of the rectangular track = 12r

Length of the two circular tracks (figure of eight) = 4πr

If A and B have to reach their starting points at the same time,

 12ra=4πrb
(where a and b are the speeds of A and B respectively)

ba=4π12

(b-a)a=4π-1212

∴ (b - a) × 100a = 0.047 × 100 = 4.7%

Hence, option (d).

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