A 150 m long train is moving to north at a speed of 10 m/s. A parrot flying towards south with a speed of 5 m/

Question

A 150 m long train is moving to north at a speed of 10 m/s. A parrot flying towards south with a speed of 5 m/s crosses the train. The time taken by the parrot to cross the train would be:

Accepted Answer

1.  **Relative Velocity:** The train and the parrot are moving in opposite directions (North and South). The relative speed ($v_{rel}$) is the sum of their individual speeds .
    $$ v_{rel} = v_{train} + v_{parrot} $$
    $$ v_{rel} = 10 	ext{ m/s} + 5 	ext{ m/s} = 15 	ext{ m/s} $$
2.  **Time Calculation:** The time ($t$) taken to cross is the total relative distance (length of the train) divided by the relative velocity.
    $$ t = \frac{	ext{Length}}{v_{rel}} $$
    $$ t = \frac{150 	ext{ m}}{15 	ext{ m/s}} = 10 	ext{ s} $$

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