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      Question

      Train 'M' is 360 meters long and it crosses a pole in

      18 seconds and it also passes Train 'N', which is moving in the opposite direction, in 12 seconds. If Train 'N' is 2 times as long as Train 'M', then find the distance travelled by Train N in 25 minutes.
      A 90 km Correct Answer Incorrect Answer
      B 96 km Correct Answer Incorrect Answer
      C 100 km Correct Answer Incorrect Answer
      D 105 km Correct Answer Incorrect Answer
      E 110 km Correct Answer Incorrect Answer

      Solution

      Speed of Train 'M' = 360 ├╖ 18 = 20 m/s Length of Train 'N' = 2 ├Ч 360 = 720 meters Combined length of Train 'M' and 'N' = 360 + 720 = 1080 meters Relative speed of train 'M' w.r.t train 'N' when travelling towards each other = 1080 ├╖ 12 = 90 m/s So, speed of Train 'N' = 90 - 20 = 70 m/s Therefore, distance covered by Train N in 25 minutes = 70 ├Ч 25 ├Ч 60 = 105,000 meters = 105 km

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