The Wright brothers made the world's first flight in a power-driven airplane. The flight lasted for 12 seconds at an average speed of 10 feet per second. The ratio of the airplane's wingspan to the distance flown was 1:3. How long was the wingspan?

40

Step-by-step explanation:

120/3=40

step-by-step explanation:

rectangles are made up of 4 right angles, which means that a side and a base meet perpendicular to one another.   their slopes then have to reflect perpendicular slopes.   perpendicular slopes are opposite reciprocals of one another.   for example, if the slope of one line is +2/3, then the perpendicular slope to that would be -3/2.   so we look for that combination in our choices.

all of them satisfy that condition (so what's the question, i guess? )