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Answer : 1 10 sec Explanation : Answer: A) 10 sec Explanation: Relative Speed = 60 -40 = 20 x 5/18 = 100/18Time = 50Distance = 50 x 100/18 = 2500/9Relative Speed = 60 40 = 100 x 5/18Time = 2500/9 x 18/500 = 10 sec.

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