A bus leaves a station a 1 pm and goes north at a rate of 5 mi/h at 2 pm one hour later a second car leaves,?

Question:traveling south at a rate of 49 mi/h. at what time will the tow cars be 320 mi apart?

ahhh!
please help with set up here!
thanks
mary

Answers:
for the first hour they are moving apart at 5mph (is the bus really going that slow?) after that they are moving apart at 54 mph.

Is that enough of a set up?
approx 6 hours 51 min

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