A vertical stick 20cm long casts a shadow 15cm long. At the same time, a tower casts a shadow 30 metre long. What is the height of the tower ?

let the height of the tower be h m. its shadow is 30m. long.

the length of shadow of a 20 cm long vertical stick is 15cm long.

At a given time of day ,the ratio of height of an object to the length of its shadow is same for all objects.

therefore:

therefore height of the tower is 40 m.

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