Jack travelled 360 km at an average speed of 80 km/h. elaine
took 1.5 hours more to complete the same amount of distance.
what was elaine's average speed for the whole journey?
km/h

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.