A plane left 40 minutes late due to bad weather and in order to rea...

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A plane left 40 minutes late due to bad weather and in order to reach its destination, \( 1600 \mathrm{~km} \) away in time, it had to increase its speed by \( 400 \mathrm{~km} / \mathrm{hr} \) from its usual speed. Find the usual speed of the plane.
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