Yumi picks up litter for 3 miles and takes two hours longer than juan, who picks up litter for 2 miles. if it took juan x hours, how long did it take yumi?

Yumi picks up litter for 3 miles and takes two hours longer than juan, who picks up litter for 2 miles.
if it took juan x hours,        his rate is 2/x
So it took Yumi x+2 hours,her rate is 3/(x+2)
Because both them have same rate 2/x=3/(x+2)
                                                     2(x+2)=3x
                                                             x = 4
It takes Yumi 6 hours.     

You can find the area of a rectangle by multiplying the length and height. so multiply 1/2*7/4(which is the simpler version of 1 3/4) and you get 7/8 as your answer.