Question

If a train runs at 40 km/hr, it reaches its
destination late by 11 min. but if it runs at 50
km/hr, it is late by 5 minutes only. The correct
time for the train to cover its journey is
(a) 13 minutes (b) 15 minutes
(c) 21 minutes (d) 19 minutes​

Answer 1

Answer:

19 minutes

Step-by-step explanation:

• Let  the correct time for the train to complete the journey is x minuets

• Then train cover distance in x+11 minuets at speed 40 km\hr =40(x+11) /60 km

• Then train cover distance in x+5 minuets at speed 50 km\hr =  50(x+5) /60 km

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

• 40x+440=50x+250

• −10x=−190

• x=19 minutes