since distance = speed * time,
60(t+1) = 80t
Now just find t. That's the time traveled by the faster train.
A freight rain leaves a station and travels north at a constant rate of 60 mph. One hour later a passenger train leaves the same station traveling north on a parallel track at 80 mph. How long will it take for the passenger train to draw even with the freight train?
2 answers
Or, reason like this:
after 1 hour, the freight train is 60 miles ahead.
Since the passenger train goes 20 mi/hr faster, how long will it take to make up the 60 miles?
after 1 hour, the freight train is 60 miles ahead.
Since the passenger train goes 20 mi/hr faster, how long will it take to make up the 60 miles?