So basically you, then, finally, you
Speed v = distance travelled / time taken
v = d / t
v = 540 / 60h
v = 9 km /h
All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons. As you move down the table, every row adds an orbital.
Answer:

Explanation:
Given data:



Let the distance traveled by the object in the second case be 
In the given problem, work done by the forces are same in both the cases.
Thus,





Tectonic plates and convection cells move tectonic plates