A man of height 180 cm is moving away from a lamp post at the rate of 1.2 m per sec. If the height of the lamp post is 4.5 m , find the rate at which :- (a) = his shadow is lengthening ; (b) = the tip of his shadow is moving. Hence give (a)+(b).
NOTE :- both (a) and (b) are in m/s (metre per second)
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