Hi
The bus travels 1 hr more than the car
Let x and (x+1)represent the time traveled for car and bus respectively
Question states*** (NOte: D = r*t)
50mph*x = 40mph*(x+1)
Solving for x
10x = 40
x = 4hr, time for car. Time the bus traveled was 5hr
CHECKING our Answer***
50mph*4hr = 40mph*5hr = 200mi