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How fast is 347.90 yards per hour?

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It's about 0.0000009 times as fast as a bolt of Lightning.
In other words, 347.90 yards per hour is 0.000000900 times the speed of a bolt of Lightning, and the speed of a bolt of Lightning is 1,100,000 times that amount.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 380,000,000 yards per hour when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about 2,000,000 times as fast as Grass growing.
In other words, 347.90 yards per hour is 2,200,000 times the speed of Grass growing, and the speed of Grass growing is 0.000000450 times that amount.
(for Kentucky Bluegrass, Poa pratensis) (a.k.a. Smooth Meadow grass, a.k.a. Common Meadow grass) (Summer months, ideal growing conditions)
Kentucky Bluegrass, one of the most common grasses in North America, grows about 0.00017 yards per hour in the summer months under ideal conditions. When left un-mowed, Kentucky Bluegrass grows to heights of 60 to 90 cm (2 to 3 ft) and blossoms with a blue flower.
It's about 0.0000000003 times as fast as The Speed of Light.
In other words, 347.90 yards per hour is 0.000000000294759250 times the speed of The Speed of Light, and the speed of The Speed of Light is 3,392,599,210 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 exactly 1,180,285,270,000 yards per hour, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 786,856,845,000 yards per hour when passing through the glass of a typical window.