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the distance between Delhi and Agra is 200 km A train travels the first hundred kilometre at a speed of 50 kilometre per hour how fast must the train travel the next hundred kilometre so as to average speed 70 km/hr for the whole journey? |
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Answer» 700/6 km/hrExplanation:TIME taken to travel FIRST HALF distance = 100/ 50 = 2 hrsTime is taken to travel second half distance = 100/vAverage SPEED = 200/ (2 + 100/v)70 = 200/ (2 + 100/v)2 + 100/v = 20/7100/v = 20/7 – 2 = 6/7v = 100 * 7/6 Km/hv = 700/6 km/h |
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