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An airplane flew for 6 hours with a 22-km/h tail wind. The return flight against the same wind took 8 hours. Find the speed of the plane in still air
6 × 22 = 8 × ( s - w ) ; and s + w = 22 ; where s = the speed of the plane in still air and w = the speed of the wind ; 132 = 8 × ( s - w ); s - w = 16,5 km/h; s+ w = 22 km/h
----------------------------------( + ) 2s = 38,5 km/h; s = 38,5÷2; s = 19,25 km/h ;
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