Professor Rosseforp runs to work every day. On Thursday he ran 10% faster than his usual average speed. As a result, his journey time was reduced by minutes.
How many minutes did the journey take on Wednesday? Give your answer in terms of .
Select one option, then click Submit.
11x
10x
9x
8x
5x
Select an option, then submit.
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Senior Mathematical Challenge 2012 (2012)
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