The average walking speed is about 4.5 feet per second.
To work this out we need to convert the value for metres into feet. There are 3.2808399 feet in a metre, so we have to multiply the value by 3.2808399:
750 x 3.2808399 = 2460.629925
The next step in figuring out the time is to divide this distance by the speed (4.5 per second):
2460.629925/4.5 = 546.80665
This can then be divided by 60 to give a more appropriate answer in minutes:
546.80665/60 = 9.113
So 750 metres should take about 10 minutes to walk.
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1 kilometre = 1000 metres so 3/4 km = 3/4*1000 metres = 750 metres.
An aerial length of 750 metres is required
220 cubic metres.
It is a figure that is 0.28 metres of 280 millimetres long.
It depends on the speed at which you walk, and how long you can sustain that speed.