Blake's position, x as a function of time, t, is x = 5t
The position of Blake is the distance of Blake from the reference point of Denise.
The total distance from Blake to Denise = 20 + 30 = 50 m
Time taken by Blake to meet up with Denise = 10 seconds
Assuming that he runs at constant speed;
speed = 50/10
speed = 5 m/s
Distance = speed * time
Let Blake's position be x
Let time be t
Blake's position as a function of time, will be x = 5t.
In conclusion, distance or position is the product of velocity and time.
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