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A square field ABCD of side 90 m is so located that its diagonal AC is from North to South and the corner B is to the West of D. Rohan and Rahul start walking along the sides from B and C respectively in the clockwise and anticlockwise directions with speeds of 8 km/hr and 10 km/hr. Where shall they cross each other the second time?

A. On AD at a distance of 30 m from A
B. On BC at a distance of 10 m from B
C. On AD at a distance of 30 m from D
D. On BC at a distance of 10 m from C

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