Two trains, each 200 m long, moving in opposite directions, cross each other in 8 seconds. If one is moving twice as fast the other, then the speed of the slower train is:

• ক 40 km/hr
• খ 70 km/hr
• গ 30 km/hr
• ঘ 60 km/hr ✅ সঠিক উত্তর