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Rohan covers `2/3` rd of a certain distance in 2 hours 30 minutes at the rate of `x` kmph. He covers the remaining distance at the rate of `(x\ +\ 2)` kmph in 50 minutes. What is the total distance? `21\ k m` b. `18\ k m` c. `16\ k m` d. `15\ k m`

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