Two trains left the station simultaneously in opposite directions. One – at a speed of 72 km / h

Two trains left the station simultaneously in opposite directions. One – at a speed of 72 km / h, the second – 84 km / h. What was the distance between them when the second train traveled 2520 km?

This task is solved in 3 steps.

First, let’s find how long it took for the second train to travel 2520 km, for this we divide the distance by the speed:
2520: 84 = 30 hours.
Now you need to find the distance that the first train was able to travel during this very time, in 30 hours:
72 * 30 = 2160 km.
Finally, it’s time to find the distance between trains:
2520 +2160 = 4680 km.