Didn't know if this was the right category to put this into but anyway.

I got the following problem. There is a lantern that has a height of 11 meters

a man with a height of 2.20 meters is standing at the lantern's base. The man starts moving away from the lantern with a velocity of v=2 m/s. I need to find with what velocity his shadow grows. Please this is urgent. Thx from now.