Question
Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:
Answer: Option D
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Relative speed = (60 + 40) km/hr = \(\left(100\times\frac{5}{18}\right)m/sec=\left(\frac{250}{9}\right)m/sec\)
Distance covered in crossing each other = (140 + 160) m = 300 m.
Required time = \(\left(300\times\frac{9}{250}\right)sec= \frac{54}{5}sec=10.8sec.\)
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