A metro train runs at the speed of 40 km/h from station A to station B covering a distance of 30 km. It stops at 5 stations in between, for 5 minutes at each station. What is the average speed (in km/h) of the train from A to B?

Solution (By Examveda Team)

Speed = 40 km/hr
Distance = 30 km
Time = $$\frac{{30}}{{40}}$$ × 60 = 45 min
Stoppage time = 5 × 5 = 25 min
Total time = 70 min
$$\eqalign{ & {\text{Average speed}} = \frac{{{\text{Total distance}}}}{{{\text{Total time}}}} \cr & = \frac{{30}}{{70}} \times 60 \cr & = \frac{{180}}{7} \cr & = 25.7 \cr} $$