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      Question

      In a race of 1.8 km, 'C' gives 'D' a head start of 360

      metres and still beats him by 180 metres. If 'D' takes 21 minutes to complete the race, what is the time taken by 'C'?
      A 12 mins Correct Answer Incorrect Answer
      B 19.5 mins Correct Answer Incorrect Answer
      C 15 mins Correct Answer Incorrect Answer
      D 14.7 mins Correct Answer Incorrect Answer

      Solution

      ATQ,

      Distance covered by 'D' when 'C' finishes 1800 m = 1800 - 360 - 180 = 1260 m

      Speed ratio (C : D) = 1800 : 1260 = 10 : 7

      Time ratio = 7 : 10

      Time taken by C = (21/10) Γ— 7 = 14.7 minutes

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