Question 166412
d=rt  __  distance out is the same as distance back


the total time is 7hr __ if t is the time out, then 7-t is the time back


rate with the wind is 280+40 or 320


rate back is 280-40 or 240


320 * t = 240 * (7-t) __ 320t=1680-240t __ 560t=1680 __ t=3


substituting __ d=320(3) __ d=960 (one way)