point B because the figure flips over the line of reflection, the rightmost point of the reflected figure will be the leftmost point of the original object
(1/10) / 1 = 3 / x.....1/10 m to 1 second = 3 m to x seconds cross multiply (1/10)(x) = (3)(1) 1/10x = 3 x = 3 / (1/10) x = 3 * 10/1 x = 30 seconds <====
