SOLUTION: A six-passenger plane cruises at 180 mph in
calm air. If the plane flies 7 miles with the wind in the
same amount of time as it flies 5 miles against the wind,
then what is the
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Question 398291: A six-passenger plane cruises at 180 mph in
calm air. If the plane flies 7 miles with the wind in the
same amount of time as it flies 5 miles against the wind,
then what is the wind speed?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
A six-passenger plane cruises at 180 mph in
calm air. If the plane flies 7 miles with the wind in the
same amount of time as it flies 5 miles against the wind,
then what is the wind speed?
...
ground speed = 180 mph
wind speed = xmoh
..
with wind speed = 180+x mph
against wind speed = 180-y mph
...
time with wind = 7/(180+x)
time against wind = 5/(180-x)
...
7/(180+x)=5/(180-x)
cross multiply
7(180-x)=5(180+x)
1260-7x=900+5x
7x+5x=1260-900
12x=360
/12
x= 30 mph wind speed
...
m.ananth@hotmail.ca
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