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Discussion :: Chain Rule

  1. A tower 17.5 m high casts a shadow of 40.25 m. What is the height of the building which casts a shadow 28.75 m long under similar conditions?

    2. A.
    10 m
    B.
    17.2 m
    C.
    12.5 m
    D.
    21.25 m

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    Answer : Option C

    Explanation :

    Let the height of the building is x
    Now, the shadow ratio = building ratio
    Height is directly proportional to shadow, so:
    40.25: 28.75 = 17.5: x
    Now, x = (28.75* 17.5)/ 40.25 = 12.5 m

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