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## Homework Statement

Two trains, A and B, are moving towards each other with relative speed 0.8c. The

passing of the two trains (from when their fronts align to when their backs align) takes 20%

longer as observed from train A as is does as observed from train B. What is the ratio of the

length of A to the length of B?

## Homework Equations

I am guessing:

T'=Tsqrt(1-(v/c)^2)

L'=Lsqrt(1-(v/c)^2)

## The Attempt at a Solution

I am confused, I feel like there is missing information?

I am trying to relate these two equations! but I am really not sure how to go about solving this one! please help. just so i know where to start...

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