Trains for people

It is said that the train is synonymous to delay. Calculate the average speed of travel by train long 85 km, with regular train leave at 7:00 and arrive at 8:18, but train is late and has departure at 8:10 and arrive at 9:27.

Correct result:

v =  34.6 km/h


s=85 km t=9:277:00 t=9.457692372.4577 h  v=st=852.4577=34.6 km/h

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