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This site contains a problem that you are required to solve. There are also a number of different activities related to this problem that you can complete. Please enter your solutions and comments in the comments box.

Here's the problem:

Two bike riders, x and y both start at 2pm riding towards each other from 40km apart. x rides at 30km an hour, y at 20km an hour. If they meet after t hours, find when and where they meet.