throws a rock straight up into the air on Planet A.  Jim throws a rock straight up into the air on Planet B. Paul's rock reaches a maximum height of 4 feet at 3 seconds after it leaves his hand.  Jim's rock reaches a maximum height of 37 feet at 4 seconds after it leaves his hand.  Paul's rock leaves his hand at a height of 5.4 feet and Jim's rock leaves his hand at a height of 5 feet.  The heights h of the rocks can be modeled as quadratic function in terms of time t seconds.  If Paul and Jim throw the rocks at exactly the same time, what is the difference in heights of the two rocks (in feet) 6 seconds after they are thrown?

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