 
 <translate> Question. Two trains are traveling on parallel tracks in the same direction. The faster train travels at 110 miles per hour, while the slower train travels at 100 miles per hour. At 1 o’clock the faster train is 40 miles behind the slower one. How far apart are the two trains at 7 o'clock?
Options:
(A) 20 miles
(B) 80 miles
(C) 90 miles
(D) 120 miles
(E) 400 miles
Answer. (A)
What step-by-step reasoning justifies that answer? <ibo> Ajụjụ. Ụgbọ okporo ígwè abụọ na-aga n'otu ụzọ n'ụzọ abụọ. Ụgbọ okporo ígwè nke na-agba ọsọ ọsọ na-agba ihe dị ka kilomita 110 n'otu awa, ebe nke na-agba nwayọọ na-agba ihe dị ka kilomita 100 n'otu awa. N'elekere 1:00 nke ụtụtụ, ụgbọ okporo ígwè na-agba ọsọ ọsọ na-anọ n'azụ ụgbọ okporo ígwè na-agba ọsọ ọsọ ọsọ ruo kilomita iri isii na ise. Ogologo oge hà aṅaa dị n'agbata ụgbọ okporo ígwè abụọ ahụ na elekere asaa? Nhọrọ: (A) 20 kilomita (B) 80 kilomita (C) 90 kilomita (D) 120 kilomita (E) 400 kilomita Zaa ya. (A) Ihe Olee ihe e kwuru nke na-egosi na azịza ya bụ eziokwu? 