SOLUTION: An aircraft travels upwind with a speed of 420 mph for 7 hours. In how muchtime will it cover the same distance in absence of wind? Wind speed is 120 mph.

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Question 940246: An aircraft travels upwind with a speed of 420 mph for 7 hours. In how muchtime will it cover the same distance in absence of wind? Wind speed is 120 mph.
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
An aircraft travels upwind with a speed of 420 mph for 7 hours. In how muchtime will it cover the same distance in absence of wind? Wind speed is 120 mph.
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let x=speed of plane with no wind
let t=travel time of plane with no wind
x-120=speed of plane against the wind
travel time*speed=distance
7*420=2940 miles
..
7(x-120)=2940
7x-840=2940
7x=3780
x=540 mph(speed of plane in absence of wind)
..
travel time=distance/speed
t=2940/540
t=5.44
travel time of plane in absence of wind=5.44 hrs