A sailboat has an initial velocity of 10.0 km/h and accelerates to 20.0 km/h. Find is average velocity.

You drive West 30.0 km at 85 km/h and then drive East another 60.0 km at 95 km/h. Your average velocity for the entire drive will be... How would I go about solving this problem?

A hiker walks 1.50 km north and then 2.70 km east, all in 3.50 hourswhat is the average speed of the hiker

Car A is traveling on a highway at a constant speed.  Initial velocity A = 80 mi/h and is 380 ft from the entrance of an on-ramp when car B enters the acceleration lane at that point at a speedInitial speed B = 20.0 mi/h. Car B accelerates uniformly and enters the main traffic lane after traveling 290 ft in 3.3 s. It then continues to accelerate at the same rate until it reaches a speed of 80 mi/h, which it maintains. Determine the final distance between the two cars (in ft).