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The ratio of the speeds of a car, tra...

The ratio of the speeds of a car, train and a bus is 5:9:4. The average speed of the car, the bus and the train is 72 km/hr. what is the average speed of the car and the train together? `78\ k m//h r` b. `82\ k m//h r` c. `84\ k m//h r` d. cannot be determined e. none of these

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