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posted by Anonymous on Wednesday, July 11, 2012 at 12:02am.

average speed of a car that travel 17km in 15 minutes

Speed=distance(km)/time(mins)

1 h = 60 min 15 min = 1 / 4 h 17 / ( 1 / 4 ) = 4 * 17 = 68 km / h

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