The respective ratio between the speed of a speed of the car, bus and train is 5 : 9 : 6. The average speed of the car, bus and train is 72 km/hr together. What is the average speed (km/h)of the car and the train together?
ক
82
খ
72
গ
67
ঘ
84
সঠিক উত্তর: 84
ধরি, গাড়ি,ট্রেন,এবং বাসের গতিবেগের অনুপাত 5x,9x এবং 4x kmph