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      Question

      The average speed of a car over the first 4 hours is 50

      km/h. If the car needs to maintain an average speed of 60 km/h over a total of 8 hours, what should be its average speed for the remaining hours?
      A 50 km/h Correct Answer Incorrect Answer
      B 70 km/h Correct Answer Incorrect Answer
      C 90 km/h Correct Answer Incorrect Answer
      D 20 km/h Correct Answer Incorrect Answer

      Solution

      ATQ,

      Total distance required = 60 Γ— 8 = 480 km

      Distance covered in 4 hours = 50 Γ— 4 = 200 km

      Required distance = 480 - 200 = 280 km

      Required average speed in remaining hours = 280 Γ· 4 = 70 km/h

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