They are both the same because 680mm equals 68cm
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68 cm is greater than 680 mm. This is because there are 10 mm in 1 cm, so 680 mm is equivalent to 68 cm. Therefore, 68 cm is greater than 680 mm.
34cm + 68cm = 102cm
26.7716 inches
0.68m = 68cm
2 x (24 + 10)...68cm
Diameter = 68 cm => circumference = pi*d = 213.63 cm = 2.1363 m To travel 100 m the wheel makes 100/2.1363 = 46.81 revs.