



 
Marc, I can help get you started. If 8 workers can dig 3/8 of a tunnel in 10 days then 1 worker can dig one eighth of that amount in 10 days. One eighth of three eighths is 1/8 × 3/8 = 3/64 so
3 1/3 days is one third of 10 so how much of a tunnel can 1 worker dig is 3 1/3 days? I hope this helps,  


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