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Q.
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
View Answer
Correct choice: A
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. Also, 6x = 72 => x = 12 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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