How to pronounce 'one'?

[Zishuli]

English Language Tests, Intermediate level

ESL/EFL Test #234 "Phrasal Verbs used with Criminal Activity", question 7

After a one-hour high-speed chase, the police finally ......... the criminal.

(a) put over
(b) pulled over
(c) beat over
(d) kept up

English Language Tests, Intermediate level

ESL/EFL Test #234 "Phrasal Verbs used with Criminal Activity", answer 7

After a one-hour high-speed chase, the police finally pulled over the criminal.

Correct answer: (b) pulled over

Your answer was: correct
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Hi,
I wonder shouldn't we use "an" one-hour high -speed chase instead of "a" in this case?

[Mister Micawber]

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'One' is pronounced with an initial consonant sound, /w/.
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Native English teacher at Mister Micawber's