Mosi walks half a distance at 2 km/h and runs back the other half. If the total distance is 16 km and it takes 6 hours for the entire trip, how fast does he run?

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Half the distance is 16/2=8km, so it will take 4 hrs at a speed of 2km/hr.

That leaves 6-4=2 hrs to run back 8km.  So he must run 8km in 2hrs which is 4km/hr, and that’s his speed.

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