Question 754884
Constructing a right angled triangle
with adjacent = 7.5 km
Angle =(360 - 320) 40 degrees.
To find: the hypotenuse
Using Cos = Adjacent/Hypotenuse
      Cos (40) = 7.5/Hypotenuse
      Hypotenuse = 7.5/cos 40
      Hypotenuse = 9.8 Km (1 decimal place)
Therefore they are 9.8 km away from camp.
Hope this helps
:-)