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.
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The train travels at 123.7 km/h
Average speed = Total Distance/Total Time = 350/3 = 116.66... km per hour.
Speed = Distance/Time = 100 km / 4 hours = 100/4 km per hour = 25 kph
131.82 miles per hour.
370 km/ 87 hours ~= 4.25 km/hr