A survey is to be made of grocery shoppers in Los Angeles, Omaha, and Miami. First, a preliminary telephone survey is made in each city to identify consumers in certain economic and ethnic groups willing to cooperate, and also to determine what supermarket characteristics they deem important. This will take 5 days in Los Angeles, 4 days in Miami, and 3 days in Omaha. After the telephone survey in each city, a list of shoppers to be personally visited is prepared for that city. This takes 6 days for Miami and 4 days each for Omaha and Los Angeles. After all three telephone surveys are made, a standard questionnaire is prepared. This takes 3 days. When the list of consumers to be visited has been prepared and the questionnaire is ready, the questionnaire is administered in each city. This takes 5 days in Los Angeles and Miami and 6 days in Omaha. How long will it take until all three cities are surveyed?
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