Flying at constant speed, an airplane of type I (plane I) covers a certain distance between two points in 15 hours. An airplane of type II (plane II) covers the same distance in 10 hours. If plane I makes a landing after flying for 9 hours along the route, how many hours will it take plane II to complete the remainder of the route between the landing point of plane I and the destination?
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A$$\frac{2}{5}$$
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B$$\frac{2}{5}$$
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C2
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D3
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E4
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正确答案: E