The following tracks are designed to present some related rates problems for you to attempt. Click each title to see a demo to help you to visualize the situation. 

For the ladder problem and the airplane problem, there are supplemental sites (#4 and #6) that presents another similar problem explained. 

Site #5 explains the actual cone problem in site#2. 

Site #7 is a nice resource site for when you need a refresher.

Site #8 provides additional problems and their solutions.