 
<translate> Amsar = B. 70 mil Saurin dangantaka = 130 - 100 = 30 mil a kowace awa A cikin sa'o'i 3, bambanci = 30 * 3 = mil 90 Fast jirgin kasa trailing 20 mil, don haka tasiri bambanci = 90 - 20 = 70 mil Saboda haka, amsar ita ce (B). <eng> 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). 