im in desperate need of help with a certian physice question im struggling on. heres the question: "A pilot is required to fly directly from london to rome, in 3.5hours. the displacement is 1400km [S 43degrees E]. a wind is blowing with a velocity of 75km/h [E]. what is the required velocity of the plane relative to the air." -if anyone who knows the full solution it would be great.