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Re: A car was driving at 60 Km/h for 20 minutes, and then at 90Km/h for an
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18 Jul 2016, 15:12
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The ratio of times traveled is 1:2 and time varies inversely with speed (2:1), then the weight of 90Km/h must be twice than that of 60Km/h . Therefore, Option A. 80
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86% (01:02) correct 
