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These trains are fast. They can travel at very high speeds.

These trains are fast. They can travel at very high speed.

Can I say "at very high speed" in that context? If it is possible, what's the difference between two sentences?

[I can say the first version in my native language, but it's very, very informal.]

2 Answers 2

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Say Eurostar can travel at 179, 180 or 190 miles per hour. It can travel at very high speeds. Right now it goes 160mph, which is still a very high speed.

“High speed” for the general case is also fine.

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In English, both are possible. I slightly prefer the second but there isn't much difference. Neither is notably informal.

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