In a race u drove 1st lap with 40kmph and in the second lap at what speed u must drive so that ur average speed must be 80kmph.
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in a race u drove 1st lap with 40kmph and in the second lap at what speed u must drive so that ur average speed must be 80kmph. average speed of both the laps is 80kmph. time req. to cover 1 lap = 80km/40kmph = 2 hrs.
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