Question 949122
Train A travels 100 km in (100 km/30 km/hr)=3.33 hours +5 minute stop.
Train B travels 100 km in (100 km/40 km/hr)=2.5 hours +5 minute stop.
However, since Train B left an hour later, he reaches the destination 3.5 hours after Train A started, therefore he is 10 minutes later than Train A. 
ANSWER: Train A arrives at the destination first.