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cau 3 con tuy vao cach nghi cua ta.boi vi de bai ko noi ro.chi noi la thoi gian giai cac cau toan gap doi cac cau khac cho nen co the hieu theo 2nghia: 1 la thoi gian giai 1cau toan gap doi thoi gian giai 1 cau khac; 2 la thoi gian giai toan bo cac cau toan gap doi thoi gian giai tat ca cac cau khac. Do do neu thao 1 thi dap an la 1,2h; neu theo 2 thi dap an la 2h
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