 
<translate> Anyị buru ụzọ gbanwee oge nke awa 4 nkeji 20 n'ime nkeji 2 awa 20 nkeji = 2 × 60 + 20 = 140 nkeji. A na-enye ọsọ ọsọ nke S site na oge / oge. Ya mere S = 280 kilomita / 140 nkeji = 2 kilomita / nkeji. Enwere nkeji iri isii n'otu elekere, yabụ ọsọ bụ 2 * 60 = 120 kilomita kwa elekere. <eng> We first convert the time of 4 hours 20 minutes in minutes 2 hours 20 minutes = 2 × 60 + 20 = 140 minutes. Average speed S is given by distance / time. Hence S = 280 miles / 140 minutes = 2 mile / minute. There are 60 minutes in an hour so the speed is 2 * 60 = 120 miles / hour. 