Practice Test Discussion

Q)

A person divides his total route of journey into three equal arts and decides to travle the three parts with speeds of 40, 30 and 15 km/hr respectively. Find his average speed during the whole journey?

    • Explanation

    According to the question,

    A=40, B=30, C=15

    we know the formula,

    Average speed during the whole journey = 3ABCAB+BC+CD

    The average rate for the whole journey

    = 3×40×30×1540×30+30×15+40×15=3×40×30×152250

    = 24 km/hr

    Hence, Option A is correct.

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