How much time does it take Noah to travel 300m traveling 20m/s ?

Work shown:

distance = rate*time

300 = 20*t

300/20 = 20t/20 divide both sides by 20

15 = t

t = 15

It will take him 15 seconds to travel 300 meters.

Side notes:

pls ask

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4