 
<translate> Milinsa na farko ya kasance cikin mintuna 6, sannan mintuna 5, wani mintuna 5 kuma milinsa na karshe ya kasance mintuna 4 don haka ya dauke shi 6 + 5 + 5 + 4 = mintuna 20. Ya ɗauki minti 20 don gudu mil 4 don haka lokacinsa na matsakaici shine 20 / 4 = minti 5 a kowace mil. Amsar ƙarshe: 5. <eng> His first mile was in 6 minutes, then 5 minutes, another 5 minutes and his final mile was 4 minutes so it took him 6 + 5 + 5 + 4 = 20 minutes. It took 20 minutes to run 4 miles so his average time was 20 / 4 = 5 minutes per mile.
The final answer: 5. 