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      Question

      Out of 240 kilometres, a person covers some distance by

      foot and the rest by bicycle. If walking speed is 6 km/h and bicycle speed is 30 km/h, and 25% of the trip is done on foot, calculate the average speed of the total journey.
      A 20 km/h Correct Answer Incorrect Answer
      B 15 km/h Correct Answer Incorrect Answer
      C 40 km/h Correct Answer Incorrect Answer
      D 56 km/h Correct Answer Incorrect Answer

      Solution

      ATQ,

      Time taken walking = (0.25 Γ— 240) / 6 = 60 / 6 = 10 hours

      Time taken cycling = (0.75 Γ— 240) / 30 = 180 / 30 = 6 hours

      Average speed = 240 / (10 + 6) = 240 / 16 = 15 km/h

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