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      Question

      The speeds of three cars are in the ratio 5 : 3 : 4. The

      ratio between the time taken by these cars to cover the same distance is:
      A 12:20:15 Correct Answer Incorrect Answer
      B 12:13:15 Correct Answer Incorrect Answer
      C 10:13:15 Correct Answer Incorrect Answer
      D 16:13:15 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Speed ratio = 5 : 3 : 4 Time ∝ 1 / Speed β†’ 1/5 : 1/3 : 1/4 Convert to common denominator (LCM = 60): 1/5 = 12/60, 1/3 = 20/60, 1/4 = 15/60 Time ratio = 12 : 20 : 15

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