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Question :
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
Started 3 months ago by Shashank in
Option D
is the correct answer.
Explanatory Answer
BC = 3*AB
AB = x, BC = 3x
Let 2 trains be T1 & T2.
From A to B: Speed of T1 = s; Speed of T2 = 2s
From B to C: Speed of T1 = 2s; Speed of T2 = s
Total time taken by T1 (t1) = (x/ s)+( 3x/2s) = 5x/2s
Total time taken by T2 (t2) = (x/2s) + 3x/s) = 7x/2s
Ratio t1:t2 = 5x/2s:7x/2s = 5:7
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