Question
The speeds of train 'A' and 'B' are 12 m/s and 18 m/s,
respectively. Whereas the lengths of train 'A' and 'B' are in the ratio 5:7, respectively. If the trains take 6 seconds to cross each other while travelling in opposite directions, then find the length of train 'A'.Solution
Let the length of trains 'A' and 'B' be '5x' metres and '7x' metres, respectively. ATQ; {5x + 7x}/{12 + 18} = 6 {12x/30} = 6 12x = 180
or, x = 15
So, length of train 'A' = 5x = 5 × 15 = 75 metres
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