Question

A girl of height 90 cm is walking away from the base of a lamp post at a speed of 1.2m/sec. If the lamp is 3.6m above the ground, find the length of her shadow after 4 seconds

Answer 1

90/360=x/x+48

1/4=x/x+48

4x=x+48

3x=48

x=48/3

x=16