Find the elevation h (km) where the weight of an object is one-tenth

Problem 2:
Find the elevation h (km) where the weight of an object is one-tenth (1/10) its weight on the surface of the earth.me = 5.9742×1024 kg; re = 6,378 km
Problem 3:
 
Two identical asteroids travel through space side by side while touching each other. If the asteroids are composed of homogeneous pure iron ( = 7,874kg/m3) and are spherical, what diameter in meters and milesmust they have for their mutual gravitational attraction to be 5 N?