Correct option is A
The correct answer is 42 km/h.
Distance between Guwahati and Bangalore = 2084 km
Average Speed = Total distance/Total time
Starting time: 31st August at 13:40 Arrival time: 2nd September at 15:20
Total time = 48 H + 100 minute = 49 2/3 = 149/3
Average Speed = Total distance/Total time = 2084 3/149 = 41.2348 42 km/h