Traditional Culture Encyclopedia - Photography major - Two cars, A and B, set off from AB, which is 420 kilometers apart, and walked in opposite directions. Three hours later, the difference between the two cars is still 30 thousand.

Two cars, A and B, set off from AB, which is 420 kilometers apart, and walked in opposite directions. Three hours later, the difference between the two cars is still 30 thousand.

Let the speed of B be x km/h (the distance between the two cars is still 30 km after 3 hours, so there should be only one possibility that the two cars did not meet).

72×3+3X=420-30

X=58

answer