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Answer : 4 48 sec Explanation : Answer: D) 48 sec Explanation: Relative speed = 60 90 = 150 km/hr.= 150 x 5/18 = 125/3 m/sec.Distance covered = 1.10 0.9 = 2 km = 2000 m.Required time = 2000 x 3/125 = 48 sec.

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