1. 3 hours, 43 minutes, 39 seconds
   4 hours, 9 minutes, 34 seconds
2. 13 hours, 44 minutes, 9 seconds

Xu ran the 2004 Beijing Marathon backwards in 3 hours, 43 minutes and 39 seconds.

1. 973.21 mph (1,566.22)
   2,913.17 mph (4,688.29)
2. 3,237.92 mph (3,529.56 kph)

Captain Eldon W. Joersz and Major George T. Morgan pushed the Blackbird to 2,913.17 mph (3,529.56 kph). That's about the speed a bullet leaves a rifle.

1. 135 mph (217 kph)
   155 mph (250 kph)
2. 175 mph (282 kph)

It was 155 mph 250 kph). And we're assuming it was an ace.

1. 256.310 mph (412.490 kph)
   302.516 mph (486.852 kph)
2. 351.062 mph (564.979 kph)

Carr's cycle went 351.062 mph (564.979 kph) -- which means he covered that kilometer in about 17 seconds.

1. 92 mph (184 kph)
   69 mph (111 kph)
2. 29 mph (47 kph)

Turowski somehow gunned the sofa to 92 mph (148 kph) in 2007. How he got the idea to make a motorized sofa is another mystery.

1. 168 mph (270 kph)
   178 mph (286 kph)
2. 188 mph (303 kph)

The jai alai ball can travel around 188 mph (302 kph). Yeah, that thing could leave a mark.

1. 5.37 mph (8.64 kph)
   5.73 mph (9.22 kph)
2. 7.35 mph (11.82 kph)

Jager averaged 5.37 mph (8.64 kph) over 50 yards (43 meters) that day. So does that mean the rest of us swim, like, one mile per hour?

1. 637.053 mph (1,025.234 kph)
   763.035 mph (1,227.982 kph)
2. 876.353 mph ( 1,410.353 kph)

Green's car obviously wasn't your garden-variety model -- it was powered by two Rolls-Royce Spey 202 jet engines and topped out at 763.035 mph (1,227.985 kph).

1. 156.83 mph (252.39 kph)
   168.35 mph (270.93 kph)
2. 185.63 mph (298.74 kph)

Origone raced down the slopes at a mind-blowing 156.83 mph (252.4 kph).

1. 47 mph (76 kph)
   67 mph (108 kph)
2. 87 mph (140 kph)

In another example of \"this we'd have to see with our own eyes,\" the desk blazed across the bridge at 87 mph (140 kph).