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I rode one-third of a journey at 10 km a...

I rode one-third of a journey at 10 km an hour, one-third more at 9, and the rest at 8 km an hour; if I had ridden half the journey at 10, and the other half at 8 km per hour, I should have been half a minute longer on the way. I ride for x distance. Then x is :

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