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      Question

      Train 'A' is 480 meters long and crosses a pole in 24

      seconds. It also crosses Train 'B' in the opposite direction in 12 seconds. If Train 'B' is twice as long as Train 'A', then find the distance travelled by Train 'B' in 45 minutes.
      A 240 km Correct Answer Incorrect Answer
      B 200 km Correct Answer Incorrect Answer
      C 270 km Correct Answer Incorrect Answer
      D 260 km Correct Answer Incorrect Answer
      E 300 km Correct Answer Incorrect Answer

      Solution

      Speed of Train 'A' = 480 ├╖ 24 = 20 m/s Length of Train 'B' = 2 ├Ч 480 = 960 meters Combined length of Train 'A' and 'B' = 480 + 960 = 1440 meters Relative speed of Train 'B' w.r.t Train 'A' = 1440 ├╖ 12 = 120 m/s So, speed of Train 'B' = 120 тИТ 20 = 100 m/s = 100 ├Ч (18/5) = 360 km/h Distance covered by Train 'B' in 45 minutes = 360 ├Ч (45/60) = 270 km

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