Posted by **Calculus** on Friday, October 1, 2010 at 2:14pm.

A runner sprints around a circular track of radius 150 m at a constant speed of 7 m/s. The runner's friend is standing at a distance 300 m from the center of the track. How fast is the distance between the friends changing when the distance between them is 300 m? (Round to 2 decimal places.

- Calculus -
**Still need help**, Friday, October 1, 2010 at 3:10pm
Still not getting this! My teacher has me so confused.

right now i have 2L(dL/dt)=2(150)(300)sin(theta)(dtheta/dt)

I think that the angle changes at 7/150 but idk =[

- Calculus -
**MathMate**, Friday, October 1, 2010 at 10:29pm
See repost:

http://www.jiskha.com/display.cgi?id=1285961612

- Calculus -
**Anonymous**, Tuesday, November 8, 2016 at 7:56pm
45

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