A bus covers a 50-kilometre distance in 1 hour 15 minutes, whereas the same distance is covered by a car in 45 minutes.Whatis the ratio of the speed of the bus to the speed of the car?

3 : 5

As, distance is same . So , Speed is inversely proportional to time .

1 hour 15 minute = 75 minutes

Ratio of            Bus      :       Car

Time                 75        :         45

                        5         :          3

Speed               3         :          5

So , Speed of Bus to the Speed of Car is 3 : 5 .