Dunnhumby Interview Question | Street Lights

Question

How many street lights are there in India? You can assume any missing data but it should be based on the facts.

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Dhruv2301 55 years 0 Answers 1488 views Great Grand Master 0

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    The number of street lights in india
    ASSUMPTIONS
    let us assume total area covered by india = 2000 thousand km per sqaure
    out of which 80% is land and the reamining 20% includes water bodies and forest in india.
    let us assume that the land covered is further divided into two categories –
    —Advanced cities and remote areas –
    The advanced cities covers 60% of land, where as remote areas covers 40%.

    let us assume that in advance cities on an average have 10 street lights per 1 km/sq.
    and remote areas on an average have 5 street lights per 1 km/per square

    So, total land area = 2000 * (80/100) = 1600 thousand km per square
    out of which land covered by forest and water bodies = 2000 *(20/100) = 400 thousand km per square

    Thus, 1600 thousand km per square is further divided into-
    The area covered by advanced cities = 1600 * (60/100) = 960 thousand km per square
    The area covered by remote areas = 1600 * (40/100) = 640 thousand km per square

    The street lights in advanced cities = (960,000)*10 = 9,600,000 street lights
    The street lights in remote areas = (640,000)* 5 = 3,200,000 street lights

    So, total street lights in india = (9,600,000 + 3,200,000) = 12,800,000 street lights

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