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    Question

    If a truck moves at a constant speed of 30 km/h for 1

    kilometre and 45 km/h for the next 1 kilometre. What is the average speed of the truck?
    A 32 km/h Correct Answer Incorrect Answer
    B 36 km/h Correct Answer Incorrect Answer
    C 38 km/h Correct Answer Incorrect Answer
    D 34 km/h Correct Answer Incorrect Answer

    Solution

    The average speed is calculated as follows:   Total distance = 2 km   Total time = 1 / 30+ 1/ 45 hours   = 3/90+2/ 90 =5/90= 1/18 hours   Average speed = 2 km/ (1/18) hours = 36 km/h So, the average speed is 36 km/h.

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