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    Question

    A car was driven for 2.5 hours at a speed of 100 km/h and

    then for 1.5 hours at a speed of 80 km/h. Find the car's average speed for the total journey.
    A 92.5 km/h Correct Answer Incorrect Answer
    B 50.5 km/h Correct Answer Incorrect Answer
    C 44.5 km/h Correct Answer Incorrect Answer
    D 55.8 km/h Correct Answer Incorrect Answer

    Solution

    ATQ,

    Total distance travelled by the car = 100 × 2.5 + 80 × 1.5 = 250 + 120 = 370 km

    Total time taken = 2.5 + 1.5 = 4 hours

    So, average speed = total distance travelled ÷ total time taken = 370 ÷ 4 = 92.5 km/h

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