Answer :
Fred's speed as relative to alice is V = 0.6873c.
Speed is defined as the distance covered in a unit of time. It is the rate of a moving object. The scalar quantity, or speed, is the size of the velocity vector. There is no direction to speed. When an object moves more slowly, it is thought to be traveling at a lower speed; when it moves more quickly, it is thought to be traveling at a higher speed.
Explanation
The formula below mentions the traditional way to determine an object's constant velocity while it is traveling straight.
r = d / t
where r stands for rate or speed (sometimes denoted as v, for velocity)
The distance traveled is d.
The motion's execution time is measured in t.
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