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39. The distance between Delhi and Agra is 200 km. A train travels the first 100 km at a speed of 50 km/h. Howfast must the train travel the next 100 km, so as to average 70 km/h for the whole journey?​

Answer» <html><body><p><strong>Answer:</strong></p><p> Time taken to travel <a href="https://interviewquestions.tuteehub.com/tag/first-461760" style="font-weight:bold;" target="_blank" title="Click to know more about FIRST">FIRST</a> <a href="https://interviewquestions.tuteehub.com/tag/half-1014510" style="font-weight:bold;" target="_blank" title="Click to know more about HALF">HALF</a> distance = 100/ 50 = <a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a> hrs</p><p>Time is taken to travel <a href="https://interviewquestions.tuteehub.com/tag/second-1197322" style="font-weight:bold;" target="_blank" title="Click to know more about SECOND">SECOND</a> half distance = 100/v</p><p>Average speed = 200/ (2 + 100/v)</p><p>70 = 200/ (2 + 100/v)</p><p>2 + 100/v = 20/7</p><p>100/v = 20/7 – 2 = 6/7</p><p>v = 100 * 7/6 Km/h</p><p>v = 700/6 km/h</p></body></html>


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