If a train runs at 40 km/hour, it reaches its destination late by 11 minutes. But if it runs at 50 km/hour, it is late by 5 minutes only. The correct time (in minutes) for the train to complete the journey is?
a) 13
b) 15
c) 19
d) 21
e) None of these
a) 13
b) 15
c) 19
d) 21
e) None of these