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      Question

      The distance between city L and city M is 624 km. A train

      starts from L at 8 a.m. at 48 km/h. Another train starts from M at 9:30 a.m. towards L at a speed of 96 km/h. When will they meet?
      A 12:50 p.m. Correct Answer Incorrect Answer
      B 1:10 p.m. Correct Answer Incorrect Answer
      C 1:20 p.m. Correct Answer Incorrect Answer
      D 1:30 p.m. Correct Answer Incorrect Answer
      E 1:40 p.m. Correct Answer Incorrect Answer

      Solution

      Time gap = 1.5 hours β†’ Distance = 48 Γ— 1.5 = 72 km
      Remaining distance = 624 – 72 = 552 km
      Relative speed = 144 km/h
      Time = 552 / 144 = 3.833 hrs = 3h 50m
      Meeting time = 9:30 a.m. + 3h 50m = 1:20 p.m.

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