a women travels from x to y distance of 1000 miles in 10 hours . she returns to x in 4 hours . find her average speed
speed from x to y = 1000 / 10 = 100 mph speed from y to x = 1000 / 4 = 250 mph average speed = 2 * 100 * 250 / 350 = 142.8 mph answer is c
divide(1000, divide(add(10, 4), const_2))