2/20 is equivalent to 1/10 because 2/2 is equal to 1 and 20/2 is equal to 10.
Step-by-step explanation:

Angle C must = [180 - 73 - 57 ] = [180 - 130] = 50°
And using rhw Law if Sines, we have.....
AB/sin C = AC/sin B → 24/sin(50) = AC/sin(73) → AC = 24*sin(73)/sin(50) = about 29.96 in
3/4*3=2 1/4
The race is 2 1/4 miles long
Hope this helps :)