Question 8 (1 point)

Flying with the wind a plane went 189 km/h. Flying into the same wind the plane only went 155

km/h. Find the speed of the wind and the speed of the plane in still air. (write and solve a system

of equations)

Step-by-step explanation:

Let the speed of the plane in still air and speed of wind are  

P  and  W  km per hour.

The speed of the plane with wind is  

P+W=189 km per hour   ______________ (1)      

The speed of the plane against wind is

P-W=155 km per hour __________________  (2)

Now Adding equations (1) and (2)  we get

  P+W=189

______________

Substituting the values of P in the equation (1) we get  

a rotation about point l

step-by-step explanation:

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