Question 155510
There is an important equation of motion {{{v = s/t}}} v-velocity, s-distance, t-time. We will use this to solve our problem. First we know the time 2 hours and 15 minutes that is 2.25 hours. We isolate t in the equation and get {{{t = s/v}}}, we know two distances a and 2a (twice longer) and two velocities 5 and 8 mi/h and we can formulate {{{a/5 + 2a/8 = 2.25}}}
Cheers,
Adam
p.s. don't forget that a is not a complete distance ;)