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    Question

    Vikas covered a certain distance by bike. If he covers

    40% of the distance at 40 km/h, 50% of the distance at 25 km/h and the remaining 10% distance at 10 km/h. Find his average speed over the whole distance.
    A 26 km/h Correct Answer Incorrect Answer
    B 28 km/h Correct Answer Incorrect Answer
    C 25 km/h Correct Answer Incorrect Answer
    D 30 km/h Correct Answer Incorrect Answer

    Solution

    ATQ, Let the total distance be 100x Now, Average speed = (100x)/[{(100x ├Ч 40%)/40}+{(100x ├Ч 50%)/25}+{(100x ├Ч 10%)/10}] = [100x/{(40x/40)+(50x/25)+(10x/10)}] = {100x/(x+2x+x)} = (100x/4x) = 25 km/h

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