Practice Test Discussion

Q)

A man divides his total route of journey into three equal parts and decides to travel the three parts with speed of 15 km/hr, 10 km/hr and 5 km/hr, respectively. Find his average speed of during journey?

    • Explanation

    According to the question

    we know the formula,

    Average speed during whole journey= 3ABCAB+BC+CAkm/hr

    ∴Required average speed == 3×15×10×515×10+10×5+15×5=2250150+50+75=2250275

     = 8.18 km/hr

    Hence, Option C is correct.

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