 
 <translate> Answer = B. 70 miles
Relational speed = 130 - 100 = 30 miles per hour
In 3 hours, difference = 30 * 3 = 90 miles
Fast train trailing 20 miles, so effective difference = 90 - 20 = 70 miles
Thus, the answer is (B). <ibo> Azịza = B. 70 kilomita Relational ọsọ = 130 - 100 = 30 kilomita kwa awa N'ime awa atọ, ọdịiche = 30 * 3 = 90 kilomita Ụgbọ oloko na-agba ọsọ ọsọ na-agafe kilomita iri abụọ, ya mere ọdịiche dị mma = 90 - 20 = kilomita iri asaa N'ihi ya, azịza ya bụ (B). 