what is the meaning of inclination 1 in 20

Question

A bus of mass 6 metric tons is pulled at a speed o 18KMPH  on a smooth incline of inclination 1 in 20.power of the engine is.

 

Answer 1

This is Rise to Run.  So 1 in 20 means that for every 20 units the bus travels horizontally, the bus rises 1 unit in altitude. The bus is going uphill.  Think of it like a right triangle.  The base (horizontal line a to b) is 20 units.  The height (vertical line b to c) is 1 unit.  The incline is the line from a to c (with the angle at point b being a 90 degree angle).      

 

Hope this helps you.