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A girl of height 90cm is walking away fr...

A girl of height `90cm` is walking away from the foot of a lamp-post at a speed of `1.2m//sec`. If the lamp is at a height of `3.6m` from the ground, then the length of the shadow of the girl after 4 sec is

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