Reasoning
Average Speed Equal Time
Calculate average speed when time intervals are equal.
Average Speed = (u + v)/2
Formula Explanation
When equal time is spent at two speeds, use arithmetic mean.
Variables Explained
u, v = two speeds.
Solved Example
Travelled at 40 km/h and 60 km/h for equal time. Average speed?
(40+60)/2 = 50 km/h.