Question: What is the speed limit through the hindhead tunnel?
Disambiguated questions and answers: question: What is the speed limit in miles per hour through the hindhead tunnel?
What is the speed limit in kilometers per hour through the hindhead tunnel?
answer: 70
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question: What is the speed limit through the hindhead tunnel in mph?
What is the speed limit through the hindhead tunnel in km/h?
answer: 70
113
Natural Questions answer: 70 mph (from the Wikipedia article "Hindhead Tunnel")