Abicycle completed the first 400.0 m of a ride in 86.8 s. what was the bicycle's average speed in kilometers per hour?

16.6 km/h  

Step-by-step explanation:

Speed = distance/time

           = 400.0 m/86.8 s

           = 4.608 m/s               Convert kilometres to metres

Speed = 4.608m/s × (1 km/1000 m)

           = 0.004 608 km/s     Convert seconds to hours

Speed = 0.004 608 km/s × (3600 s/1 h)

           = 16.6 km/h

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products