It's not possible to answer the question exactly the way it's written. That's because we don't know anything about the direction they drive at any time during the trip.
You see, "velocity" is not just a word that you use for 'speed' when you want to sound smart and technical, like this question is doing. "Velocity" is a quantity that's made up of speed AND THE DIRECTION of the motion. If you don't know the direction of the motion, then you CAN'T tell the velocity, only the speed.
Here are the average speeds that Lori's family drove on each leg of their trip:
Speed = (distance covered) / (time to cover the distance) .
Leg-A: Speed = 15km/10min = 1.5 km/min
Leg-B: Speed = 20km/15min = (1 and 1/3) km/min
Leg-C Speed = 24km/12min = 2 km/min
Leg-D: Speed = 36km/9min = 4 km/min
Leg-E: Speed = 14km/14min = 1 km/min
From lowest speed to highest speed, they line up like this:
Whoever drove Leg-D should have been roundly chastised and then abandoned by the rest of the family. 36 km in 9 minutes (4 km per minute) is just about 149 miles per hour !
because water is loosely packed but when it is cold it becomes closely packed in order to form ice and thus the force attraction between them also increase.
