Question

Subrahmaniyam went to his office at a speed of 6 km/hr and returned back at the speed of 3 km/hr. What is his average speed for the whole trip?
(a) 4.5 km/hr
(b) 4 km/hr
(c) 3.5 km/hr
(d) Data insufficient​

Answer 1

Answer:

b) 4km/hr is the answer.