Two trains with lengths 126 m and 119 m respectively are moving towards each other. Their speeds are 12 m/s and 23 m/s, respectively. What will be the time needed by the trains to cross each other?

35 seconds 11 seconds 21 seconds 7 seconds

7 seconds

Speed = \(\frac{Distance }{Time }\) 12 + 23 = \(\frac{\text{126 + 119}}{Time }\) Time =  \(\frac{\text{245}}{35 }\) Time = 7 seconds