Bergen Academies, a magnet high school in New Jersey, offers math competitions for area math whiz kids from 4th to 8th grade.
Here's a question on the 4th grade test from 2005:
Mary bakes a pie that starts off at 300 degrees, but it cools at a rate of 4 degrees per second. The room she is in is initially at 50 degrees, but heats up at a rate of 0.5 degrees per second. How long will it take for the room to reach half the temperature of the pie?