 
 <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? <hau> Tambaya. Jirgin kasa biyu suna tafiya a kan layi daya a cikin wannan shugabanci. Jirgin da ya fi sauri yana tafiya da mil 110 a awa daya, yayin da jirgin kasa mai jinkiri yana tafiya da mil 100 a awa daya. A karfe 1 na safe jirgin da ya fi sauri yana da nisan mil 40 a bayan wanda ya fi jinkiri. Yaya nisa tsakanin jiragen biyu a karfe 7? Zaɓuɓɓuka: (A) 20 mil (B) 80 mil (C) 90 mil (D) 120 mil (E) 400 mil Amsa wannan. (A) Ƙungiyar Wane bayani ne ya nuna cewa hakan gaskiya ne? 