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a passenger train traveled to the repair yards and back. the trip there took 12 hours and the trip back took 18 hours. what was the passenger trains average speed on the trip there if it averaged 40 km/h on the return trip?
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Distance traveled in return trip 18 x 40 = 720 km.
Total distance of trip 720x 2 = 1440 km
Total time of the trip 12 + 18 = 30 hours.
Therefore avg speed 1440/30=48km per hour
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