 <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. <yor> Ó ju bọ́ọ̀lù náà ní 80 *.2 = 16 mph kíákíá. Ó ti ń gba ìdánilẹ́kọ̀ọ́ fún ọ̀sẹ̀ mẹ́rìndínlógún. Nítorí náà, ó jèrè 16 / 16 = 1 mph ní ọ̀sẹ̀ kan. Nítorí náà ìdáhùn tí ó kẹ́yìn ni 1. 