Two boats with speeds of 9 m / s and 7 m / s moved simultaneously from two marinas in opposite directions from each other

Two boats with speeds of 9 m / s and 7 m / s moved simultaneously from two marinas in opposite directions from each other. After 12 seconds, the distance between them increased to 320 m. What was the distance between them initially?

1) 9 + 7 = 16 (m / s) – removal speed
2) 16 ◦ 12 = 192 (m) – removed from each other in 12 s
3) 320 – 192 = 128 (m) – was originally
Answer: 128 meters

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