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A boy leaves his house at …

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A boy leaves his house at 9:30 a. m for his school . The school is 2km away classes start at 10:00am. If he walks at a speed of 3km/h for the first kilometer at what speed should he walk the second kilometer to reach just in time?

    • Posted by Sweta Soreng 5 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years, 2 months ago

    distance = 2 km 

    total time = 30 min = 0.5 hour

    initial speed = 3km/h for first 1 km

    Hence time taken = distance/speed = 1/3 h 

    time left = 0.5 - 1/3 = 0.5/3 h

    distance left = 1 km

    Hence speed at which he should walk the second km wouldeb 1/(0.5/3) = 6 km/h

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