 
 <translate> Answer = C. 110 miles
Relational speed = 120 - 100 = 20 miles per hour
In 4 hours, difference = 20 * 4 = 120 miles
Fast train trailing 10 miles, so effective difference = 120 - 10 = 110 miles
Therefore, the answer is (C). <hau> Amsar = C. 110 mil Saurin dangantaka = 120 - 100 = 20 mil a kowace awa A cikin sa'o'i 4, bambanci = 20 * 4 = mil 120 Fast jirgin kasa trailing 10 mil, don haka tasiri bambanci = 120 - 10 = 110 mil Saboda haka, amsar ita ce (C). 