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How fast is 139 inches per second?

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It's about 0.00000001 times as fast as The Speed of Light
In other words, 139 inches per second is 0.000000011776813945066 times the speed of The Speed of Light, and the speed of The Speed of Light is 84,912,609.18824 times that amount.
(C) (in a vacuum)
The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures 11,802,852,677.1650 inches per second, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 7,868,568,451.57480 inches per second when passing through the glass of a typical window.
It's about one-thirty-thousandth as fast as a bolt of Lightning
In other words, 139 inches per second is 0.000036 times the speed of a bolt of Lightning, and the speed of a bolt of Lightning is 28,000 times that amount.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 3,800,000 inches per second when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about one-ten-thousandth as fast as a Meteor
In other words, 139 inches per second is 0.000084 times the speed of a Meteor, and the speed of a Meteor is 12,000 times that amount.
(formally Meteoroid or meteorite, depending on the context; a.k.a. "shooting star", a.k.a. "falling star")
Small meteoroids enter the Earth's atmosphere at speeds between 440,000 inches per second and 2,800,000 inches per second, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 110,000 inches per second.
It's about one-two-thousandth as fast as The Space Shuttle
In other words, 139 inches per second is 0.0004559 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 2,193.3 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 304,870 inches per second. During liftoff, the space shuttle accelerates to orbital speed in 8.5 minutes, consuming over 1.59 million kg (3.51 million lbs) of propellant in the process.
It's about one-two-hundred-fiftieth as fast as a Bullet (Rifle)
In other words, 139 inches per second is 0.0039 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 259 times that amount.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 36,000 inches per second. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about one-two-hundredth as fast as a Jet Fighter
In other words, 139 inches per second is 0.005 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 190 times that amount.
(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
An F-16's maximum speed at altitude is approximately 26,000 inches per second. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about one-one-hundredth as fast as a Bullet (Handgun)
In other words, 139 inches per second is 0.0092 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 109 times that amount.
(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 15,100 inches per second. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.