Question
Two trains ‘K’ and ‘L’ of equal lengths are
running on parallel tracks at speeds of 45 m/s and 55 m/s, respectively. If they can cross each other in ‘u’ seconds while traveling in opposite directions to each other and take 60 seconds to cross each other while traveling in the same direction, then find the value of ‘u’.Solution
ATQ, Let the length of train ‘K’ and ‘L’ be ‘k’ metres and ‘l’ metres, respectively. According to the question: 
Also, 
Dividing equation (1) by equation (2), we get: 
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