The distance from B to C is thrice that from A to B. Two trains travel from A to C via B. The speed of train 2 is double that of train 1 while traveling from A to B and their speeds are interchanged while traveling from B to C. The ratio of the time taken by train 1 to that taken by train 2 in travelling from A to C is

The distance from B to C is thrice that from A to B. Two trains travel

1.	The distance from B to C is thrice that from A to B. Two trains travel from A to C via B. The speed of train 2 is double that of train 1 while traveling from A to B and their speeds are interchanged while traveling from B to C. The ratio of the time taken by train 1 to that taken by train 2 in travelling from A to C is
A.	7 ∶ 5
B.	1 ∶ 4
C.	5 ∶ 7
D.	4 ∶ 1
Answer» D. 4 ∶ 1