 
 <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. <ibo> Ọ tụbara bọọlụ ahụ ọsọ ọsọ karịa 80 *.2 = 16 mph. Ọ nọ na-azụ ọzụzụ maka izu 4 * 4 = 16. Ya mere, o nwetara 16 / 16 = 1 mph kwa izu. Ya mere, azịza ikpeazụ bụ 1. 