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Robert is travelling on his cycle and has calculated to reach point A at 2 P.M. if he travels at 10 kmph, he will reach there at 12 noon if he travels at 15 kmph. At what speed must he travel to reach A at 1 P.M.?

A. 9 km/hour

B. 10 km/hour

C. 11 km/hour

D. 12 km/hour

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