11.7 feet per second.
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Of course, there are many other possible answers to this question, for instance,
(8miles/hour)(1km/0.62mi) = (8/0.62)km/h = 12.9km/h.
Notice that 1km = 0.62mi, and (1km/0.62mi) = 1. This approach is the key to all unit conversions, since when you multiply by 1, the quantity (speed) doesn't change.
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9.6 miles per hour.
It's Distance/Time, so 8/1 is 8. So it's 8 miles per hour. That is the average speed.
18 x 5 / 8 = 11.25mph
5.625 (= 55/8) miles per hour.
2.1 miles in 8 minutes equates to a pace of 15.75 miles per hour.