In 1-3 write the percent of each figure that is shaded

Two fire-lookout stations are 190 miles apart, with station a directly south of station b. both stations spot a fire. the bearing of the fire from station a is upper n 55 degrees upper e and the bearing of the fire from station b is upper s 60 degrees e. how far, to the nearest tenth of a mile, is the fire from each lookout station?

Math i have no idea how to do a and b

How is this equation completed? i cannot find any examples in the book.