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Question
A and B start from the same point and in the same direction at 7 am to walk around a rectangular field 400 m × 300 m. A and B walk at the rate of 3 km/hr and 2.5 km/hr respectively. How many times shall they cross each other if they continue to walk till 12.30 pm ?
Options:
A .  Not even once
B .  Once
C .  Twice
D .  Thrice
Answer: Option B

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