I don't understand how my professor got those answers and plugged in the values

1. The proper length of one spaceship is three times that of another. The two spaceships are traveling in the same direction and, while both are passing overhead, an Earth observer measures the two spaceships to have the same length. If the slower spaceship has a speed of v., :=0.350 c with respect to Earth, determine the speed of the faster spaceship. The proper Length of the faster ship is three times that of the slower ship ( Lp1 = 3. Lp2), yet they both appear to have the same contracted length L. Thus 7:= 1/1- = 0.937 Llab = Lips . V1-("= =3.V1-(02) 1- (4) =9.(1-(92)" U ss 8+ C VC=1 =0.950 where vic means v1/c 3