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Solutions
Let the speed of A and B is A, B respectively.
The ratio of the length of train A to train B = 7: 8
Train A crosses the 120 m long bridge in 24 seconds
So,
7x +120 = A* 5/18 * 24
7x +120 = A * 20/3 ----- (1)
Train B crosses the Car running in opposite direction at the speed of 80 kmph in 8 seconds
So,
8x = ( B + 80) * 5/18 * 8
8x = ( B + 80) * 20/9 ------(2)
We can’t solve both equations.