Calculus Related Rates - The Shadow Problem

This video show how to find the rate of change of the tip of a shadow from a light post.

[TojiZynin]

This channel is amazing thank you this is helping me study for finals

[hmmm]

I've noticed horizontal triangles and found that velocity should be (15/6)*(dx/dt), what is the mistake?

[vymbz]

So is x=40 not used because the derivative is linear?

[luvniwa]

that into gave me whiplash but this was very helpful I think idk I haven't watched the video yet but I think it will be

[yaanbutdiff]

Thank you sir a lot sir for this video i really appreciate it ❤️❤️❤️❤️

[tishnn]

ive watched this 4 times and i cant get it. its not you, its me, I promise.

[cuckoo]

Sir, your method is correct but answer is wrong it should have been 10/3ft/sec . not 25/3ft/sec. kindly check the mistake you have made taking the derivative of (x+ 2/3x) it should read 2/3dX/dt not 5/3dx/dt