The distance between cities A and B is 720 km. A train left A to B at a speed of 80 km / h.

The distance between cities A and B is 720 km. A train left A to B at a speed of 80 km / h. A train came out to meet him at a speed of 60 km / h. How long does it take for them to meet if the second train leaves 2 hours later?

1) Let X be the travel time of the first train.

2) Based on the condition of the problem, we compose an equation and solve it:

80 X + 60 (X – 2) = 720;

80 X + 60 X – 120 = 720;

80 X + 60 X = 720 + 120;

140 X = 840;

X = 840/140;

X = 6h;

Answer: Trains will meet 6 hours after the start of the first train.