SOLUTION: A local bus departs every 20 minutes. An express bus departs every 5/4 hours. If they depart together at 6:00 A.M., at what time will they next depart at the same time?

Question 813152: A local bus departs every 20 minutes. An express bus departs every 5/4 hours. If they depart together at 6:00 A.M., at what time will they next depart at the same time?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
There is a certain number of 1/3 hr intervals that
add up to some other number of 5/4 hr intervals.
--------------
Expressed as an equation:

where and are whole numbers

---------------
It looks like there are 15 local bus arrivals
and 4 express bus arrivals and the last ones
happen at the same time

and

So, in 5 hrs they depart at the same time

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