A bus takes 12 hours to travel the same distance that an airplane travels in 1.5 hours. The average speed of the airplane is 120 km/hour faster than five times the average speed of the bus. What is the average speed of the bus?
The speeds are:
Bus: 40 km/h
Plane: 320 km/h
Let's start with the symbols:
From the first sentence we can figure out, that:
The second sentence shows us the relation between
If we substitute
We multiply both sides by 12.
The distance is 480 km.
Now we can calculate both speeds: