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it depends on type of rc.if it contain questions written inside quotes which is a part of given rc,then dont try to waste time to read the entire passage.just look for the given words in the same and answer will be at your finger tips in seconds.otherwise just take a 2 min scanning of given rc,then focus your attention to the area of question which will drastically reduce the time spent per question.

read the paragraph carefully,mark the important lines& side by side read the question's

Te strategy is to be planned when you go through the question paper. I would suggest to refer article " UNLOCK READING COMPREHENSION" on rediff.com under section CAT 2007 by Deepak Kumar.