At what rate is the shadow of a 6-ft tall man shortening as

Last updated: 7/24/2022

At what rate is the shadow of a 6-ft tall man shortening as he walks at 8 ft/s on a level path toward the streetlight that is 20 ft above the pavement? Also, find the rate at which his head is receding from the light when he is 20 ft from the post.