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Answered 2011-09-12 22:57:11

Sandy won the race.

Jack: Runs at 30 mph to Y and at 10 mph back to X. So his avg. speed is given by the formula (2ab)/(a+b) i.e. 15 mph

Sandy: Runs at 20 mph to Y and at 20 mph back to X. So his avg. speed is 20 mph

So only Sandy wins the race.

Hope I'm correct....... Pls consult with your colleagues.....

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