Question 211676
D=RT OR T=D/R
T=440/(R+27)
T=350/(R-27)
BECAUSE THE TIMES ARE THE SAME WE SET THESE TWO EQUATIONS EQUAL.
440/(R+27)=350/(R-27)
440(R-27)=350(R+27)
440R-11,880=350R+9,450
440R-350R=9,450=11,880
90R=21,330
R=21,330/90
R=237 MPH IS THE SPEED OF THE PLANE.
PROOF:
440/(237+27)=350/237-27)
440/264=350/210
1.6667=1.6667