Answer: At t=0.015 hours when the car 0.6 miles from the check point.
Step-by-step explanation:
Since we have given that
Distance traveled by him towards a speed check point = 1.4 miles
Speed at which he is travelling = 52 miles per hour
Let the time taken by him be x
Since we have the equation

where<em> </em><em>d</em><em> </em>denotes distance
and <em>t </em>denotes time.
If we have given that the car 0.6 miles from the check point.
So, we put the value of <em>d</em> in place of it .

So, at t=0.015 hours when the car 0.6 miles from the check point.