Question 624610
Aplane travels 250 mph in still air. The plane goes 560 miles with wind and 440 miles against wind in the same time. What is speed of wind?
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let w=speed of wind
250+w=speed of plane downwind
250-w=speed of plane against wind
Travel time=distance/speed
..
560/(250+w)=440/(250-w)
560*250-560w=440*250+440w
560*250-440*250=440w+560w
1000w=250(560-440)=250*120=30000
w=30
speed of wind=30 mph