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A street lamp is 6 m above the ground . ...

A street lamp is 6 m above the ground . A man 1.8 m tall walks directly away from it at the rate `1.2 m//sec`. When hye is 9 m away, his shadow is lengthening at the rate of

A

`(9)/(7) m//sec`.

B

`(18)/(35) m//sec`.

C

`0.1835 m//sec`.

D

`0.3518 m //sec`.

Text Solution

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The correct Answer is:
B
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