X covers 1 km in 8 min 40 s while Y covers the same distance

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X covers 1 km in 8 min 40 s while Y covers the same distance in 10 min. By what distance does X defeat Y?

1. 13¹/₃ m
2. 133²/₃ m
3. 133²/₅ m
4. 133¹/₃ m

Correct Option: D

Clearly, X beats Y by 8 s.
Distance covered by Y in 600 s = 1000 m
(∵ 10 min = 600 s)
Distance covered by Y 80 s. = (1000/600) x 80 = 400/3 m = 133¹/₃ m