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    Question

    Resham travels 60 km at 20 km/h by cycle, 120 km at 60

    km/h by car, and the remaining 10 km on foot at 2.5 km/h. Find her average speed for the whole journey. (Rounded off to 2 decimal places)
    A 21.11 km/h Correct Answer Incorrect Answer
    B 12.81 km/h Correct Answer Incorrect Answer
    C 11.51 km/h Correct Answer Incorrect Answer
    D 21km/h Correct Answer Incorrect Answer

    Solution

    Total Distance = 60 km + 120 km 10 km =190 km   Time taken by cycle = 60 km/20 km/h = 3 hours   Time taken by car = 120 km/60 km/h = 2 hours   Time taken on foot = 10 km/2.5 km/h = 4 hours   Total Time =3+2+4= 9 hours   Average Speed = 190 km/9 hours = 21.11 km/h

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