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Mathematics, 13.03.2021 07:00 Gabbymadrid3240

an airplane flew 4 hrs with a 20 km per hr tail wind. the return flight against the same wind took 5 hrs. find thespeed of the plane in still air. ​

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an airplane flew 4 hrs with a 20 km per hr tail wind. the return flight against the same wind took 5...
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