Can you explain Automobile Kinematics?

[Dhenusha]

Homework Statement

An impatient motorist considers speeding as he travels between two cities. If the trip normally takes
2.80h at an average speed of 100km/h, how much time will be saved if he exceeds the speed limit by
10.0km/h?

Relevant Equations

During a short interval of time the velocity, v, in m/s of an automobile is given by


v  at2
 bt3
where the

time t is in seconds. Determine the units of a and b.

im confused

 

[kuruman]

I'm confused too. Is what you have under "relevant equations" another problem? If so, you need to post it separately. Also you need to show some effort before you can receive help. Please read the forum rules on homework help.