(200+280)/(5x+3x)= 18

480/8x= 18

x= 10/3

So the bus speed is 5x=50/3 (m/s) =60 (km/h).

The train speed is 36 (km/h).

2. Because it is divided into 15 and 6, it is inevitable that 6 is the upper part.

So the waist length is 6 and the bottom length is 9.