Quantitative Aptitude Ques 360

Question: The respective ratio between the 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/h together. What is the average speed of the car and the train together?

Options:

A) 82 km/h

B) 78 km/h

C) 84 km/h

D) Cannot be determined

E) None of the above

Show Answer

Answer:

Correct Answer: C

Solution:

  • Total speed of car, bus and trains $ =72\times 3=216,km $ Speed of car and train $ =\frac{5+9}{5+9+4}\times 216=168,km $

$ \therefore $ Average $ =\frac{168}{2}=84,km $

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