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21 January, 20:19

An auto travels at a rate of 25 km/hr for 4 minutes, then at 50 km/hr for 8 minutes, and finally at 20 km/hr for 2 minutes. find the total distance covered in km and the average speed for the complete trip in m/s.

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  1. 21 January, 20:33
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    We know that the formula for calculating distance is:

    distance d = velocity v * time t

    Calculating for each interval:

    1: 25 km/hr for 4 minutes

    d1 = (25 km / 60 min) (4 min) = 1.67 km

    2: 50 km/hr for 8 minutes

    d2 = (50 km / 60 min) (8 min) = 6.67 km

    3: 20 km/hr for 2 minutes

    d2 = (20 km / 60 min) (2 min) = 0.67 km

    The total distance covered is:

    d = d1 + d2 + d3

    d = 1.67 + 6.67 + 0.67

    d = 9 km

    The average speed is:

    s = 9 km (1000 m / km) / (14 min * 60 s / min)

    s = 10.72 m / s
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