160 mph.
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11/2 miles in 15 minutes = 6 mph
You're traveling at a speed of 100 miles per 15 minutes. Converted into other units with which you may be more comfortable, that speed is the same as: -- 586 and 2/3 feet per second -- 1,075,200 furlongs per fortnight -- 15,449.7 kilometers per day -- 400 miles per hour
15 mph
680 mph
6.4mph