Answer:
The average speed of the cyclist is 18 [tex]\frac{km}{hour}[/tex]
Explanation:
Speed is a magnitude that expresses the relationship between the space traveled by an object, the time used for it and its direction. Because it considers direction, it is a vector quantity.
Then the average speed is the quotient of the space traveled by an object and the time it takes to cover the distance traveled:
[tex]speed=\frac{distance}{time}[/tex]
In this case:
Replacing:
[tex]speed=\frac{90 km}{5 hours}[/tex]
Solving:
[tex]speed=18\frac{ km}{ hour}[/tex]
The average speed of the cyclist is 18 [tex]\frac{km}{hour}[/tex]
