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Answer : 1 60 kmph Explanation : Answer: A) 60 kmph Explanation: Speed of lorry = 36012 = 30 kmphSpeed of van =250100 x 30 = 75 kmphSpeed of bike = 35 x 75 = 45 kmphTherefore, now required average speed of bike and van  = 75   452= 60 kmph.

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