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Two trains with their speeds in the ratio of 3:4 are going in the opposite direction along parallel tracks. If each takes 3 seconds to cross a telegraph post, then the time taken by the trains, to cross each other completely, will be?
  • a)
    3 second
  • b)
    4 second
  • c)
    7 second
  • d)
    21 second
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Two trains with their speeds in the ratio of3:4are going in the opposi...
Let the speed of two trains be 3a and 4a respectively.
Length of train =3a×3=9a meter
Length of other train =4a×3=12a meter
Then,
Time taken to cross each other

=3 second
∴3 second required to cross each other.
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Two trains with their speeds in the ratio of3:4are going in the opposite direction along parallel tracks. If each takes3seconds to cross a telegraph post, then the time taken by the trains, to cross each other completely, will be?a)3secondb)4secondc)7secondd)21secondCorrect answer is option 'A'. Can you explain this answer?
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