Approx 31.3 metres per second.
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60 mph = 88 feet per second 70 mph/60 mph x 88 = 102.6 feet per second or multiply mph x about 1.46
In one minute, it will be exactly 70 miles!
Use this conversion: mph x 1.467 = feet per second
70 x 5280/3600 = 102.6 recurring fps
The conversion factor for converting from mph to furlongs per fortnight is 2,688. So, 70 mph x 2,688 = 188,160 furlongs per fortnight.