Discussion
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: D
Trains moving in the same direction close at the difference of their speeds; in opposite directions, at the sum.
\[ \text{relative speed} = 60 + 40 = 100 \text{ km/hr} = 100 \times \frac{5}{18} = \frac{250}{9} \text{ m/s} \]
\[ t = \frac{140 + 160}{250/9} = \frac{300 \times 9}{250} = 10.8 \text{ seconds} \]
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