Solve the Problem $6 \mathrm { ft }$ Tall Walks at a Rate Of

question 55

Multiple Choice

Solve the problem. Round your answer, if appropriate.
-A man $6 \mathrm { ft }$ tall walks at a rate of $3 \mathrm { ft } / \mathrm { sec }$ away from a lamppost that is $18 \mathrm { ft }$ high. At what rate is the length of his shadow changing when he is $40 \mathrm { ft }$ away from the lamppost? (Do not round your answer)

• A) \(\frac { 3 } { 2 } \mathrm { ft } / \mathrm { sec }\)
• B) \(20 \mathrm { ft } / \mathrm { sec }\)
• C) \(\frac { 3 } { 4 } \mathrm { ft } / \mathrm { sec }\)
• D) \(\frac { 3 } { 8 } \mathrm { ft } / \mathrm { sec }\)

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