Two trains 180 m and 170 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

• ক 13.4 sec
• খ 10.8 sec
• গ 12.6 sec ✅ সঠিক উত্তর
• ঘ 11.8 sec