two students walk in the same direction along a straight path at a non-constant speed -one at 0.90 m/s and the other at 1.90 m/s
a. assuming that they start at the same point and the same time, how much sooner does the fastest student arrive at a destination 780 m away?
b. How far would the students have to walk so that the fastest student arrives 5.50 min before the slowest student?