IBPS Government Jobs Exams Numerical Ability Time Distance and Speed

Train X starts at 7.00 a.m. from a certain station with A Km/h and train Y starts at 9.30 a.m. from the same station at B km/h. If B > A, then how many hours will train Y take to overtake train X?
1) 5A/(2(B-A)) hrs
2) 2A/(5(B-A)) hrs
3) (2(B-A))/5A hrs
4) (5(B-A))/2A hrs
5) None of these

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IBPS Other Question
A man gave 50% of his savings of Rs. 168200 to his wife and divided the remaining sum among his sons Abid and Bisth of 15 and 13 years of age respectively. He divided it in such away that each of his sons when they attain the age of 18 years, would receive the same amount of 5% compound interest per annum. The share of Bisth was: 1) Rs. 42050 2) Rs. 40000 3) Rs. 45000 4) Rs. 45500 The average speed of a train is 20% less on the return journey than on the onward journey. The train halts for an hour at the destination station before starting on the return journey. If the total time taken for the to and fro journey is 46 hrs, covering a distance of 2000 km, the speed of the train on the return journey is:
1) 50 km/h
2) 40 km/h
3) 60 km/h
4) 65km/h