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An airplane travels 3900 km at 810 km/h, and then encounters a tailwind that boosts its speed to 950 km/h for the next 3000 km. What was the average speed of the plane for this trip?

3900+3000
6900
6900/8
862.5
9 years ago

Answers

Damon
It goes 6900 km

the time is 3900/810 + 3000/950

so

Vaverage = 6900 / [ 390/81 + 300/95 ]

= 865.4
9 years ago

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