.
time =
=
= 1.5 hours
65 - 58 = 7 in the denominator is their relative speed.
Solved.
If you want the solution with equations, then here it is:
65*t - 58*t = 10.5, (<<<--- the difference of distances traveled in t hours)
(65-58)*t = 10.5,
t =
= the same result.