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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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โˆ™ 2013-01-17 21:14:35
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Q: What is the average speed of a train that travels at 120 km per hr for 6 hours and then 100 km per hr for 5 hours?
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