Dawn is laying computer cables in the ceiling of a large building. A 175-ft cable to office B1 and a 420-ft cable to office B2 meet at a right angle. Offices B1 and B2 are both on the outer wall of the building. If Dawn lays one
cable from where the first two cables meet directly to the outer wall, how far will it be from there to office B1?
Round your answer to the nearest tenth.
A) 79.1 ft
B) 227.5 ft
C) 67.3 ft
D) 455.0 ft

Please work it out!