Party A and Party B are facing each other from ab at a distance of 20. After meeting on the way for 2 hours, Party A returns to place a and Party B advances to place A. Party A returns to place a and Party B has a speed of 2 from place a

A return along the original road, the time is still 2 hours, B go to a when the journey, 2 hours did not finish, still 2 hours
It can be seen that B is 1 hour slower than A. B has walked for 4 hours, but it is still 2 hours behind the whole journey
Formula:
(20-2) / 4 = 4.5 is the velocity of B
4.5+1=5 .5

A and B leave from a and B at the same time. After 5 hours, they meet each other and continue to move forward. After 3 hours, a arrives at B. at this time, B is 240 kilometers away from A. how many kilometers are there between a and B?

A: the distance between a and B is 600 km

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