Discussion
Two trains 120 m and 180 m long are running in opposite directions at 54 km/hr and 36 km/hr. How long will they take to cross each other ?
Answer: A
Correct answer: 12 seconds
Moving in opposite directions, the speeds add.
\[54 + 36 = 90 \text{ km/hr} = 90 \times \frac{5}{18} = 25 \text{ m/s}\]
They must together cover the sum of their lengths, 300 m.
\[t = \frac{300}{25} = 12 \text{ seconds}\]
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