Speed is calculated by taking divided by time.

The speed of any object  is the distance travelled in a unit time  

Speed = distance / time

Unit of speed  = distance in meter / time in second

= ms-1

For example  

The speed of light is 2.9979 x108 m/s.  

Distance travel by light in 1 s = 2.9979 x108 m

Distance divided by time

Explanation:

I took the test on edge

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

the correct answer to this question is 2