A passerby chases his hat, which the wind carries at a speed of 4 m / s. After how many seconds does a passerby catch

A passerby chases his hat, which the wind carries at a speed of 4 m / s. After how many seconds does a passerby catch up with a hat if he runs at a speed of 5 m / s and is now 9 m between him and the hat?

1) 5 – 4 = 1 (m / s) – approach speed
2) 9: 1 = 9 (s) – time
Answer: after 9 seconds.

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