.6578 this would be the answer
She will have aprox. 40 pieces of ribbon
The speed of wind is 656 kmph and speed of plane is 70 kmph.
<u>SOLUTION:
</u>
Given that, an air-plane travels 4688 kilometers against the wind in 8 hours
And 5808 kilometers with the wind in the same amount of time.
We have to find the rate of the plane in still air and the rate of wind
Now, let the speed of wind be a kmph and speed of plane be b kmph.
And we know that, 

Substituting (1) in (2) we get,


On substituting (3) in (1) we get,

Hence, the speed of wind is 656 kmph and speed of plane is 70 kmph.
75:90
15:18
5:6 is the simplified of 75:90
Common solution for each problem:
let
1st point=(x1,y1)
&,
2nd point=(x2,y2),then,
distance between 1st and 2nd point is:
√[(x2-x1)²+(y2-y1)²]
Just replace these x2,y2,x1,y1 with given points and you will get required answer..