The train runs for 2 ½ hours at a speed of 62 km/hr and at a speed of 68 km/hr for 1 ¼ hours. Find the average speed of a trainA. 55 km/hr B. 64 km/hrC. 62 km/hrD. 70 km/hr

• A. A
• B. D
• C. C
• D. B