Physics homework please help!!

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    David and Matt are swimming lengths in a 25m pool. Matt swims 4 lengths in 125 m at a steady speed
    Explain what's matts velocity is during
    A the first length
    B the second length

    2- David swims at 1.25m/s. How long does it take David to swim 100m?
    3- Matt swims his four lengths in 125s, has a rest for 25s and then swims another four lengths at a speed of 0.5m/s
    A- how long does it take Matt to swim his second lot of four lengths?
    B- draw a distance time graph to show matts swim

    Please please help
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