Question

    A bus driver drives at 45 km/h and is supposed to reach

    in 2 hours. He stops for 30 minutes after halfway. What speed is needed for the rest of the trip?
    A 75 km/h Correct Answer Incorrect Answer
    B 80 km/h Correct Answer Incorrect Answer
    C 85 km/h Correct Answer Incorrect Answer
    D 90 km/h Correct Answer Incorrect Answer

    Solution

    Total distance = 45 × 2 = 90 km
    Half time = (45 ÷ 45) × 60 = 60 minutes
    Time left = 120 – 60 – 30 = 30 minutes
    Required speed = (45 ÷ 30) × 60 = 90 km/h

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