Set up equations or equations to solve application problems: both a and B robots are used to carry chemical raw materials. Type a robot carries 30kg more per hour than type B robot. It takes the same time for type a robot to carry 900kg and type B robot to carry 600kg. How much chemical raw materials do the two robots carry per hour?

Set up equations or equations to solve application problems: both a and B robots are used to carry chemical raw materials. Type a robot carries 30kg more per hour than type B robot. It takes the same time for type a robot to carry 900kg and type B robot to carry 600kg. How much chemical raw materials do the two robots carry per hour?

Suppose B-type robot transports XKG chemical raw materials per hour, then A-type robot transports (x + 30) kg chemical raw materials per hour