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A train 150 m long moves northward at 10 m/s. A parrot flies southward, parallel to the track, at 5 m/s. How much time will the parrot take to pass the entire train?

1. 12 s
2. 15 s
3. 8 s
4. 10 s

Correct answer: 10 s

Solution

To determine the time it takes for the parrot to pass the entire train, we first calculate the relative speed between the parrot and the train, which is the sum of their speeds since they are moving in opposite directions. The relative speed is 10 m/s (train) + 5 m/s (parrot) = 15 m/s. Then, we divide the length of the train (150 m) by the relative speed (15 m/s), resulting in 10 seconds.

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