This is called "Rai ka pahaad banaana" There is no rudeness or impolite behaviour. What if the original blogger was traveling for the first time in his life and asked a question. No question is stupid but answers may be.... It does not mean that we need to police everyone.
I remember long ago one person was searching for a NDLS to Mumbai ticket fare on the Mumbai to NDLS train number. In spite of many people correcting him he was saying the same thing "site is incorrect, when I search ndls to mumbai, mumbai to ndls info is coming". To this one reply was "aap sardar jee ho kya"... well may be it was rude but it was quite frustrating for...
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many as the original blogger refused to budge.

Okay, whatever you feel. Leave it. I don't find any sense in arguing further. It will only create unnecessary verbal fights among the peaceful members of this fabulous site. I just hope that the first blogger has understood it all.
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Since the first blogger had asked in Hindi, here's my answer in Hindi:
RAC का पूर्ण प्रपत्र है "रिजर्वेशन अगेंस्ट कैंसल्लाशन". इस मामले...
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में आपको गाडी के अन्दर प्रवेश करने की अनुमति है मगर आपको अपनी शायिका (बर्थ) किसी दुसरे RAC व्यक्ति के साथ बँटना होगा! अगर कोई यात्री जिसके पास confirmed टिकेट हो लेकिन वो ना आये, तो वो शायिका RAC यात्रियों को दी जायेगी.
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I just hope that my Hindi is correct. This is the first time I am posting in Hindi on this blog. A few words couldn't be translated to Hindi, and hence have been left in English.