The length of the two trains are 93m and 82 m are running at speed of 69 Km/Hr and 57 Km/Hr respectively on parallel tracks in opposite direction. In how many seconds will they pass each-other?
Solution
Relative speed = (69+57) = 126 km/hr
$= 126 \times \dfrac{5}{18}$ m/s = 35 m/s
Required time
$= \dfrac{93+82}{35} = \dfrac{175}{35} = 5 $ m/s