Quantitative Aptitude :: Time and Distance - Discussion

Show Explanation

Please attempt the question to view the Explanation !!!

Explanation:
Let's assume Man drives From point A to B i.e 150 km.
Man drive (from point A to B) in 3 hours 20 minutes (i.e 3 + 1/3 = 10/3 hours) then Speed is 150/(10/3) = 45km/hr.
Return, Man drives (from point B to A) (same 150 km) in 4 hours 10 minutes (i.e 4+1/6 = 25/6 hr) then speed = 150/(25/6) = 36km/hr.
So, Average Speed (45+36)/2 = 40.5 km/hr.
So, Average speed exceeds Speed from to by (i.e from A to B by) = (45 - 40.5) = 4.5km/hr.