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1 .
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 right
[ D ]    Cannot be determined
[ E ]    None of these
Answer : Option C
Explanation :

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