Discussion
Two trains, each 100 m long, moving in opposite directions, cross each other in 8 seconds. If one is moving twice as fast the other, then the speed of the faster train is:
Answer: C
Trains moving in the same direction close at the difference of their speeds; in opposite directions, at the sum.
\[ \text{relative speed} = \frac{100 + 100}{8} = 25 \text{ m/s} = 25 \times \frac{18}{5} = 90 \text{ km/hr} \]
With speeds \( v \) and \( 2v \):
\[ 3v = 90 \quad\Longrightarrow\quad v = 30, \qquad 2v = 60 \text{ km/hr} \]
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