The ratio of speeds of a car, a train and a bus is 5:9:4. The average speed of the car, the bus and the train is 72 km/hr together. What is the average speed of the car and the train together ?
A) 84 km/hr B) 96 km/hr C) 72 km/hr D) 60 km/hr
Answers
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Step-by-step explanation:
Let the speeds of the car, train and bus be 5x, 9x and 4x km/hr respectively. Average speed = 5x + 9x + 4x/3 = 18x /3 = 6x km/hr. Therefore, the average speed of the car and train together is = 5x+9x2= 7x = 7 x 12 = 84 km/hr.
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Answer:
correct answer is
A) 84 km/hr
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