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a trip to a destination is made in the f...

a trip to a destination is made in the following way 900 km by train at an average speed of 60 km/hr, 3000 km by plane at an average speed of 500 km/hr, 400 km by boat at an average speed f 25 km/hr, 15 km by taxi at an average sped o f45 km/hr. what is the average speed for the entire journey?

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