Question

A family will travel 350 miles from their house in order to reach Dallas TX. Which inequality can be used to find all possible values of t, the time it will take this family to reach Dallas in hours, if they travel at an average speed of atleast r miles, per hour.
A. t<=350r
B.t>r/350
C.t<=350/r
D.t>350r^2

Answer 1

V = d / t => t = d / V

V ≥ r ; d = 350 => t = d / V ≤ 350 / r

Then, t ≤ 350 / r, which is option C.