[Solved] Buses travel at an average speed of 30 km

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Buses travel at an average speed of 30 km/hour and the trains travel at an average speed of 90 km/hour. If Peter travels 15 km

Buses travel at an average speed of 30 km/hour and the trains travel at an average speed of 90 km/hour. If Peter travels 15 km by bus and 45 km by train, what is Peter's average speed during transportation (in km/hour)

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