(1) There are 340 workers in Factory A and Factory B, of which the number of workers in Factory A is three times that of Factory B, 85 workers in Factory A and 85 workers in Factory B? 255 people

(2) 3 times of12+10 = 5 times of18? Solving equations is an important process.

Solution: 5/18x-3/12x =10.

? 1/36x= 10

x=360

(3) A walks and B rides, starting from A and B at the same time and moving in opposite directions. After the meeting, A continued to go to B, and B immediately returned to B. As a result, B arrived at B two hours earlier than A, and it is known that A's speed is three-sevenths of B's speed. B How many hours does it take to get from B to A by bike? (as long as the formula)

Solution: let the speed of b be x; A needs y hours,

x×(y-2)÷2 = 3/7xy；

Solution, y =14;

B usage: 14-2= 12 hours.