| If a train runs at 30 km/h it reaches its destination late by 9 min. If it runs at 36 km/h it is late by only 3 min. The correct time for the train to complete its journey is |
A) 20 min
B) 24 min
C) 27 min
D) 26 min
Correct Answer: C
Solution :
| Let the correct time to complete the journey be x min. |
| Distance covered in \[(x+9)\] min at 30 km/h. |
| Distance covered in \[(x+3)\] in 36 km/h. |
| \[\therefore \] \[\frac{x+9}{60}\times 30=\frac{x+3}{60}\times 36\] |
| \[x=27\,\,\min \] |
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