A train travelling at a speed of 75 mph enters a tunnel 3 1/2 miles long. The train is 1/4 mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?

• ক 2.5 min
• খ 3 min ✅ সঠিক উত্তর
• গ 3.5 min
• ঘ 3.2 min