A train covers a distance in 50 min, if it runs at a speed of 48 kmph on an average. The speed at which the train must run to reduce the time of journey to 40 min will be.

60 kmph

Speed = \(\frac{ Distance}{ Time}\)

48 km/hr = \(\frac{ Distance}{ \text{5/6 hr} }\) 

Distance = 48 x \(\frac{5 }{6 }\)

Distance = 40 km

Speed at which the train must run to reduce the time of journey to 40 min

Speed = \(\frac{40km}{ 4/6hr}\)

Speed = \(\frac{240km}{ 4hr}\)

Speed = 60 km/hr