Discussion
A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?
Answer: A
Trains moving in the same direction close at the difference of their speeds; in opposite directions, at the sum.
\[ \text{relative speed} = 120 + 80 = 200 \text{ kmph} = 200 \times \frac{5}{18} = \frac{500}{9} \text{ m/s} \]
\[ \text{total length} = \frac{500}{9} \times 9 = 500 \text{ m} \]
\[ \text{other train} = 500 - 270 = 230 \text{ m} \]
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