After talking with his girlfriend on the telephone long distance, a student calculates the amount of money he spent on the call. The first 20 minutes were 99 cents, and each additional minute was 10 cents. He calculated that his phone call cost $ 5.49. How long was his call?

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After talking with his girlfriend on the telephone long distance, a student calculates the amount of money he spent on the call. The first 20 minutes were 99 cents, and each additional minute was 10 cents. He calculated that his phone call cost $ 5.49. How long was his call?






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