# SOLUTION: Show a complete solution. Big plane. A six-passenger plane cruises at 180 mph in calm air. If the plane flies 7 miles with the wind in the same amount of time as it flies 5 mi

Algebra ->  Algebra  -> Complex Numbers Imaginary Numbers Solvers and Lesson -> SOLUTION: Show a complete solution. Big plane. A six-passenger plane cruises at 180 mph in calm air. If the plane flies 7 miles with the wind in the same amount of time as it flies 5 mi      Log On

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 Algebra: Complex Numbers Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Complex Numbers Question 235915: Show a complete solution. Big plane. A six-passenger plane cruises at 180 mph in calm air. If the plane flies 7 miles with the wind in the same amount of time as it flies 5 miles against the wind, then what is the wind speed?Answer by checkley77(12569)   (Show Source): You can put this solution on YOUR website!D=RT OR T=D/R T=7/(180+W) T=5/(180-W) SEEING AS THE TIMES ARE EQUAL WE SET THESE 2 EQUATION EQUAL 7/(180+W)=5/(180-W) 7(180-W)=5(180+W) 1,260-7W=900+5W -7W-5W=900-1,260 -12W=-360 W=-360/-12 W=30 MPH.IS THE WIND SPEED. PROOF: 7/(180+30)=5/(180-30) 7/210=5/150 1/30=1/30