Two trains are coming from opposite directions with speed of 75 km/hr and 100 km/hr on to parallel tracks. At some moment the distance between them is 100km. After T hours, distance between them is again 100 km. T is equal to?

• ক 8.7 hr ✅ সঠিক উত্তর
• খ 2 hr
• গ 1 hr
• ঘ 11hr