Here is some useful information serving as India guide
At India Airport
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You will have to complete immigration / customs formalities at every airport in India. Airport departure taxes apply at different levels for neighbouring countries and may not be included in the cost of your tour. On Indian Airlines flights checked-in baggage allowance in economy class is 20 kilograms per person and in business class it is 30 kilograms per person.
Weather in India
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Indian weather is h ot tropical with variations from region to region. Coolest weather lasts from November to mid-March, with cool, fresh mornings and evenings and dry, sunny days. Really hot weather in India, when it is dry, dusty and unpleasant, is between April and June. Monsoon rains occur in most regions in summer between June and September.
What to Wear
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Travel in India as light as possible so that you can go home with lots of souvenirs. Women should dress conservatively. The best outfit, especially during the hot summers is a T-shirt worn with loose cotton trousers. These are comfortable, cool and easily washable. You can purchase them anywhere in India, at very reasonable rates.
Business Hours
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In the cities, offices are generally open from about 9.30 am to 5.30 pm on weekdays. Saturdays may be off, half-day or full working days.
Tipping in India
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In India hotels and restaurants, tips are not normally included in the bill. Some India hotels include service charges on their bills. In such cases tipping is not necessary. The standard tip is 10%. In India hotels, porters and room service attendants are normally tipped at the end of the stay, though an early tip is likely to get you better service. Tipping of taxi drivers is not customary.
Electricity
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The voltage used is 220 volts. You can purchase a converter at most hardware stores for appliances that do not switch to 220V.
Communication
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Internet Connection can be slow but you will rarely fail to find a selection of Internet cafes. Fax/Telex/Telegram can be availed from large hotels in India and telegraph offices in major cities in India.
Safety
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India guide explains that follow the same rules of safety that you follow traveling anywhere else with respect to using India hotel lock boxes and keeping India travel documents safe. When in public places, keep them in your hotel or with you all the time when moving about.