It is: 1.5 metres
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Eight and one half is 8.5
One half of one percent = 0.005
One half is 1/2, which is 0.5 written as a decimal. 3 and (plus) 0.5 is 3.5. So 3 and one half is written 3.5
2 and 1/2 as a decimal is 2.5
1.5 hours