Two trains of lengths 160 meters and 140 meters are moving in opposite directions at 55 km/h and 65 km/h, respectively. Find the time taken by them to cross each other completely.
9 seconds
When two trains move in opposite directions, their relative speed is the sum of their speeds.
Relative speed \(= 55 + 65 = 120\) km/h.
Convert to m/s: \(120 \times \frac{5}{18} = \frac{100}{3}\) m/s.
Total distance to be covered while crossing \(= 160 + 140 = 300\) m.
Time \(= \frac{300}{\frac{100}{3}} = 300 \times \frac{3}{100} = 9\) seconds.
Hence, the trains take 9 seconds to cross each other completely.
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