(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.