Qwizy BINGO - Related Rates Question #14

$Solve each related rate problem. A $6\,ft$ tall person is walking away from a $20\,ft$ tall lamppost at a rate of $3\,ft/sec.$ Assume the scenario can be modeled with right triangles. At what rate is the length of the person's shadow changing when the person is $20\,ft$ from the lamppost?$