PHYSICS
posted by Daniel .
A car traveling at a constant velocity of 30.0 m/sec passes an intersection at time t=0. 45 seconds later a second car passes the same intersection and its traveling in the same direction at a constant velocity of 55 m/sec.
when does the second car overtake the first car?
how far have the cars traveled when this happens.?

A race car travels northward on a straight, level track at a constant speed travels 0.760 km in 20.0 s. The return trip over the same track is made in 25.0 s.
(a) What is the average velocity of the car in m/s for the first leg of the run?
m/s
(b) What is the average velocity for the total trip?