An train travels 10 miles at a speed of 50 miles per hour. How fast must the train travel on the return trip if the round-trip travel time is to be 20 minutes?

• ক 78 miles per hour
• খ 75 miles/hours ✅ সঠিক উত্তর
• গ 65 miles per hour
• ঘ 55 miles/hours