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A reconnaissance plane flies 425 km away from its base at 212 km/h, then flies back to its base at 305 km/h. What is its average speed?

______ km/h

Mar 3rd, 2015

The total speed is 425 km

Going speed is 212 km/h

Time = 2.004716981132075

Total speed = 425 km

Coming speed = 305 km/h

Time = 1.39344262295082

Total time = 3.398159604082895

Avg. speed = 3.398159604082895 /425 km

                   = 0.0079956696566656

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Mar 6th, 2015

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