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Hello.
00:02
In this question, you and your friend are driving and you started by taking 16 kilometers in the east direction, and then you started to move 80 kilometers in south direction.
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The purpose of this question is to compare between the concept of speed and the concept of velocity.
00:23
So in part a, we're asked to calculate the average speed of the trip, and in part b, we're asked to calculate the average velocity of the trip.
00:32
The difference between speed and velocity is that velocity is only concerned with the displacement, while the speed is concerned with the path that you have taken already.
00:44
So in that case, let's first calculate here the average speed.
00:52
The average speed, again, as we said, is distance over time.
01:00
And the distance crossed here in that case is 16 plus 80 kilometers, which is 96 kilometer.
01:10
And the time of this entire trip was 40 minutes.
01:14
So let's divide by 60 in order to get the number of hours, which is two -thirds.
01:21
So we get our answer in kilometer per hour...