Air pressure decreases at a rate of 2.25 Pa (pascals) per kilometer in the eastward direction. In addition, the air pressure is decreasing at a constant rate with respect to time everywhere. A ship sailing eastward at 14 km/hour past an island takes barometer readings and records a pressure drop of 70 Pa in 2 hours. Estimate the time rate of change of air pressure on the island. (pascal is a unit of air pressure 1Pa=1N/m^2=1kg/m∗s^2)   Time rate of change of air pressure =

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