1. Suppose the original speed is x, the original total time consumption is 720,000/x, the current driving speed is 1.2x, and the total time consumption after acceleration is 720,000/1.2x. The equation is, 720,000/x-720,000//kloc-0.

2. Let Xiao Wang be X and Xiao Li be Y, then the simultaneous equations can be solved when 90/x= 120/y and x+y=35.

3. Let A plant X trees every hour and B plant Y trees every hour, then Y-X = 3,60/X = 66/Y, and solve the simultaneous equations.