Week || Best Time
1 || 3.67 min
2 || 3.20 min
3 || 2.75 min
4 || 2.30 min
5 || 2.05 min
6 || 1.67 min

Image source: by Taylor Evans

Above is Josh's fastest times (for each week) to swim 100 meters100 \text{ meters}. By how many seconds has Josh improved in these 66 weeks?

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Type a concept, like “slope” or “photosynthesis”.

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