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Average speed
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A car drives with an average speed of 80km/h for 5km. The first half it drives at 95km/h. How fast did it drive for the second half of the distance? |
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Time taken? 80 kms = 60mins 5 kms =? 5 kms = (5 * 60) / 80 5 kms = 3.75 minutes. First half :- 95 kms = 60mins 2.5 kms =?? 2.5kms = (2.5*60) / 95 2.5kms =1.5789 minutes 2nd half = 3.75 - 1.5789 = 2.1711 2.1711 minutes = 2.5 kms 60 minutes =?? ( 60 *2.5) /2.1711 = 69.089 answer = 69.089 kms/hour. |
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