Q40. If a train runs at 40 km/h, it reaches its destination late by 11 min, but if it runs at 50 km/h, it is late by 5 min only. The correct time for the train to complete its journey is
(c) 19 min
Let the correct time to complete the journey be x minutes.
Distance covered in (x+11) min at 40 km/h.
= Distance covered in (x+5) min at 50 km/h
∴(x+11)60×40=(x+5)60×50⇒x=19 min