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66 SECONDS. WHEN THE CLOCK STRUCK SIX, THERE WERE ONLY 5 INTERVALS BETWEEN STROKES, AND EACH INTERVAL WAS 6 (30/5) SECONDS. BETWEEN THE FIRST AND TWELFTH STROKES THERE WILL BE 11 INTERVALS OF 6 SECONDS EACH; THEREFORE, 12 STROKES WILL TAKE 66 SECONDS BOTH ENDS ARE NAILED WITH THE SAME NAIL. IN ORDER FOR THE 10 FOOT CHAIN TO DIP DOWN 5 FEET, IT MUST DIP 5 FEET DOWN AND 5 FEET UP, TOTALING THE LENGTH OF THE CHAIN IT WILL TAKE 5 DAYS FOR 100 PEOPLE TO BUILD 100 HOUSES. 1 PERSON CAN BUILD 1 HOUSE IN 5 DAYS. SO, 100 PEOPLE CAN BUILD 100 HOUSES IN 5 DAYS BEFORE I LEFT, I WOUND THE WALL CLOCK. WHEN I RETURNED, THE CHANGE IN TIME EQUALED HOW LONG IT TOOK TO GO TO MY FRIENDS HOUSE AND RETURN, PLUS THE TIME I SPENT THERE. BUT I KNEW THE LATTER BECAUSE I LOOKED AT MY FRIENDS WATCH WHEN I ARRIVED AND LEFT. SUBTRACTING THE TIME OF THE VISIT FROM THE TIME I WAS ABSENT FROM MY HOUSE, AND DIVIDING BY 2, I OBTAINED THE TIME IT TOOK ME TO RETURN HOME. I ADDED THIS TIME TO WHAT MY FRIEND WATCH SHOWED WHEN I LEFT, AND SET THE SUM ON MY WALL CLOCK