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.