| 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? |
A) 82 km/h
B) 78 km/h
C) 84 km/h
D) Cannot be determined
E) None of the above
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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