If a train runs at $40$ kmph, it reaches its destination late by $11$ minutes but if it runs at $50$ kmph, it is late by $5$ minutes only. The correct time for the train to complete its journey is:

Both are same then 40/60(x+11)=50/60(x+5)

40x+440=50x+250

10x=−190

x=19 minutes