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    Question

    A car travels from point A to point B at a speed 20%

    slower than its usual speed and arrives 30 minutes late. If the distance between A and B is 150 km, what is the car's usual speed?
    A 65 km/h Correct Answer Incorrect Answer
    B 70 km/h Correct Answer Incorrect Answer
    C 75 km/h Correct Answer Incorrect Answer
    D 80 km/h Correct Answer Incorrect Answer
    E 85 km/h Correct Answer Incorrect Answer

    Solution

    Let the usual speed of car = 10x km/h Speed of car when it travels with 20% less speed = 80% of 10x = 8x Difference of time taken = 30 minutes x = 7.5 usual speed of car = 10x =  75 km/h

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