a race car is one lap behind lead race car when lead has 42 laps to go; if lead averages 56.2m/hr what mus avg

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1 Michael C // May 13, 2008

You are missing a critical piece of data. How long is a lap? 1 mile?
2 JG // May 13, 2008

The lead car has to go 42 laps in the time our car goes 43. The ratio of the speeds must be 43/42.

56.2*43/42 = 57.54 mi/hr

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