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29 September, 17:19

Serena and Venus Williams start 150m apart and begin running towards each other. Serena has a speed of 7.5 m/s and Venus has a speed of 5.0 m/s. How long does it take for them to meet?

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  1. 29 September, 17:20
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    - - Serena is running toward Venus at 7.5 m/s.

    - - Venus is running toward Serena at 5.0 m/s.

    - - The space between them is shrinking at (7.5 + 5.0) = 12.5 m/s.

    - - The space started out at 150m wide.

    It will shrink to zero after

    (150 m) / (12.5 m/s) = 12 seconds
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