Question 603093
1)A plane traveled 630 miles to Tokyo and back. The trip there was with the wind.It took 7 hours. The trip back was into the wind. The trip back took 21 hours. What is the speed of a plane in still air? what is the speed of the wind?
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Find the 2 groundspeeds.
with the wind, 630/7 = 90 mi/hr (some plane)
against the wind, 630/21 = 30 mi/hr
The plane's airspeed is the average: (90 + 30)/2 = 60 mi/hr
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The windspeed is the difference: 90 - 60 = 30 mi/hr
Shoulda taken a bus.