A train without stoppage travels with an average speed of 80 km/h and with stoppage, it travels with an average speed of 64 km/h. For how many minutes does the train stop on an average per hour?

Solution (By Examveda Team)

$$\eqalign{ & \left( {\frac{{{\text{Faster speed}} - {\text{Slower speed}}}}{{{\text{Faster speed}}}} \times 60} \right){\text{min/hr}} \cr & = \frac{{80 - 64}}{{80}} \times 60 \cr & = \frac{{16}}{{80}} \times 60 \cr & = 12{\text{ min}} \cr} $$