About 18.7736250 seconds assuming that air friction is zero. I used a graphing calculator.. I'm not sure about what the formula for figuring this out is.
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It would take 12.75 seconds to fall 2600 feet with gravity, s= 1/2 g t2
45.5 mph
Well the average terminal velocity ofr an average sized jumper is 120mph. I fall at 120mph and fall 10,000 feet in 45/50 seconds so I guess about 213 feet per second.
15 miles/hour (5280 feet/1 mile)(1 hour/3600 seconds) = 22 feet per second
.41 tenth of a second = 0.041 seconds. 40 feet in 0.041 seconds = 975.61 feet/sec = 665.2 miles per hour. That is very fast for a ball. I can't think of any sport shifting a ball at that speed. In tennis the top players get the ball going at over 100mph, but not over 150mph, the same in cricket.