Chris, who is 6 feet tall, is walking away from a street light pole 30 deet high at a rate of 2 feet per second.

a. How fast is his shadow increasing in length when chris is 24ft from the pole? 30 feet? -- I already found that to be 1/2 ft per sec.

b. How fast is the tip of his shadow moving?

c. To follow the tip of his shadow, at what angular rate must Chris be lifting his eyes when his shadow is 6ft long?

Please help with b and c!