railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Speed Time and Distance Average Speed
R runs for 10 hours at speeds of 10 km/h, 9 km/h,....,1 km/h, respectively, in the first hour, second hour, and so on. His average speed is _______ km/h.
1
4.5
2
5.
3
6
4
5.5