A person of height 1.6 m is walking away from a lamp post of height 4 m along a straight path on the flat ground. The lamp post and the person are always perpendicular to the ground. If the speed of the person is 60 cm s, the speed of the tip of the person's shadow on the ground with respect to the person is _______ cm s.
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Answer: 40
[JEE Advanced 2023 · Paper 1]