It is a measure of speed.
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well its 5 hours
In 6 hours @ 120 km per hour, the train travels 120*6 = 720 km. In 5 hours @ 100 km per hour, the train travels 100*5 = 500 km. So, in all the train travels 720 + 500 = 1220 km in 6 + 5 = 11 hours. Its average speed is 1220/11 =110.9090.. recurring km per hour.
You are traveling at 1,280 km per hour.
3475 km / 5 hr = 695 km/h
2.5 km per hour