a train running between two stations 50km apart arrives on time if it travels at an average speed of 60 km/h. How late will it be if it travels at an average sp

On time :
s=50 Km
v=60km/h
t = s : v
= 50Km : 60Km/h
= 5/6 h

Late :
s=50Km
v=50Km/h
t = s : v
= 50Km : 50Km/h
= 1h

1h - 5/6h = 1/6h
1/6h = 1/6 x 60min = 10min

At an average speed of 50Km/h, the train will be 10 minutes late.