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A bus travels at a speed of 50 km per ho...

A bus travels at a speed of 50 km per hour to go from its origin to its destination at a distance of 300 km and travels at a speed of 60 km per hour to return to the origin. What is the average speed of the bus?

A

54·55 km per hour

B

55 km per hour

C

55·55 km per hour

D

54 km per hour

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