Two trains meet

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A train leaves Rock City at an average speed of 50 miles per hour and heads for Gnome City. Another train leaves Gnome City at an average speed of 40 miles per hour and heads for Rock City. If the route is 360 miles long, how many hours will it take for the 2 trains to meet?

Source: http://mason.gmu.edu/

5 hours 2 hours 6 hours 4 hours

s/Julia Ding by s/Julia Ding , 32, USA

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1 solution

Their relative speed is 50+40=90. There distance is 360. So the time taken is 360 90 \dfrac{360}{90} = 4 hours.

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