Question 450457
George bicycles at 18mph. Sam roller blades at 22mph. 
If they both leave the same place at the same time, after how much time will they be 12 miles apart?
:
let t = travel times (hrs) for them to be 12 mi apart
:
18t + 22t = 12
40t = 12
t = {{{12/40}}}
t = .3 hrs which is .3(60) = 18 min