If a train runs at 40 kmph it reaches its destination late by 11 minutes but if it runs at 50 kmph i...........

Quantitative Aptitude ( CCS) Time & distance

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:

13 min

15 min

19 min

21 min

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Explanation:

Let the correct time to complete the journey be x min.
Distance covered in (x + 11)
min.= Distance covered in (x + 5) min at 50 km/hr
(x+11)60 * 40
= (x+5)60 * 50
=x = 19 min.

Hence, option 3 is the correct answer.