Arun covers first 28 kms of his journey in 45 minutes and the remaining 32 kms in 35 minutes. What is his average speed in m/s?

$12\frac{1}{2}$

Total Distance = 28+32 = 60 km = 60000 m

Total Time = 45+35 = 80 minutes = 80*60 = 4800 seconds

Average speed = 60000/4800 = 100/8 = 25/2

The correct answer is Option (1) → $12\frac{1}{2}$