Arnold is testing a new train locomotive on circular rail track with a radius of 0.9 kilometers. How many times around the track does Arnold need to run the train to cover a distance of at least 50 kilometers?

Arnold, the worldwide known brand in the N-scale, is back in the market with a selected range of new products. Many of the Arnold range of American outline locomotives will now feature NEM couplings and sprung buffers, as well as being pre-fitted with a socket for a DCC decoder.

N SCALE LOCOMOTIVES

From tables, the speed of sound at 0°C is approximately

V₁ = 331 m/s (in air)

V₃ = 5130 m/s (in iron)

Distance traveled is

d = 100 km = 10⁵ m

Time required to travel in air is

t₁ = d/V₁ = 10⁵/331 = 302.12 s

Time required to travel in iron is

t₂ = d/V₂ = 10⁵/5130 = 19.49 s

The difference in time is

302.12 - 19.49 = 282.63 s

 283 s (nearest second)

Step-by-step explanation:

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