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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:

9
9.6
10
10.8
Explanation:
Relative speed = (60 + 40) km/hr =$ \left(100 \times\dfrac{5}{18} \right) $m/sec=$ \left(\dfrac{250}{9} \right) $m/sec.

Distance covered in crossing each other = (140 + 160) m = 300 m.

Required time =$ \left(300 \times\dfrac{9}{250} \right) $sec=$ \dfrac{54}{5} $sec = 10.8 sec.
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