Question 111994
The fisrt bus left at 1:00PM going at 44mph.  The total distance that we are looking for is 274m.  We need to subtract the 44M forom the total of 274M since the second bus doesn't start until an hour later.  So now, our total distance is 230M.

274M - 44M = 230M

Now, we can find the combined rate at which the busses are separating.

44mph + 48mph = 92mph

We can plug are known variables into the distance formula to find T, time.

D = RT

230M = 92mphT

T = 2.5 

Two and a half hours plus two o'clock (the time that the second bus started) gives us a time of 4:30PM.