Single Variable Calculus

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Moderate

Related Rates with a Growing Shadow

SVCALC-6IEKAZ

A $6$ ft tall man walks away from a street lamp $18$ ft high at a rate of $5$ ft/sec. At what rate is his shadow growing when he is $20$ feet from the lamp?

A

$\dfrac{5}{3}$ ft/sec

B

$5$ ft/sec

C

$10$ ft/sec

D

$1$ ft/sec