A girl of height 90 cm is walking away from the base of a lamp-post at – InterviewSolution

1.	A girl of height 90 cm is walking away from the base of a lamp-post at a speed of 1.2 m/s. If the lamp is 3.6 m above the ground, find the length of her shadow after 4 seconds.
Answer» `/_ABE and /_CDE` `angleB=angleD=90^o` `angleAEB=angleCED` `/_ABE`~`/_CDE`(AA) `(AB)/(CD)=(BE)/(DE)` `3.6/0.9=(BD+DE)/(DE)` `(BD)/(DE)=3` `(DE)=(BD)/3=4.8/3=1.6m`

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