一块地有6.48公顷，用一台播种机播种，作业宽度1.8米，如果用拖拉机牵引，每小时可行6千米．播种完这块地需要多少小时？
直接写出得数：×2=÷=+= 4×（+）= 1÷37.5%= 5÷5÷= 32﹣32×=（ ﹣）×20=
直接写出计算结果．== 8×= 12=== 2﹣= 1=
直接写出得数． 3×=÷0.5= 9÷=÷﹣= （1﹣）÷= 2÷×=
直接写得数．×6= 30×=÷= 20÷=+=××0=×= 1÷×= 5.6÷0.08= 39××=
直接写得数．﹣=÷=×=×= 10×=×=÷=÷= 15×=÷=+=÷22=
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