 
 <translate> He threw the ball 80 * .2 = 16 mph faster. He was training for 4 * 4 = 16 weeks. So he gained 16 / 16 = 1 mph per week. So the final answer is 1. <hau> Ya jefa kwallon 80 *.2 = 16 mph sauri. Ya yi horo na tsawon makonni 4 * 4 = 16. Saboda haka ya samu 16/16 = 1 mph a mako. Saboda haka amsar karshe ita ce 1. 