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(Solved): a train travels 120km at a speed of 60 km/h and then return at a speed of 90km/h. What is the averag ...
a train travels 120km at a speed of 60 km/h and then return at a speed of 90km/h. What is the average speed of the entire trip?
a) 70
b) 72
c) 75
d) 78