What speed of the plane if it for the one twelfth share of hour prolelet 65 km? Detailed solution of a task

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1/12 (a share of hour), 1 hour----x km 65÷(1/12)=65/13 × 12/1=780 of km/h makes 65 km to find number on its shares (parts) it is necessary to divide number into a part, it corresponding .
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