3939. Watches are made in three factories and go to the store. The first plant produces 40% of all products, the second - 35%, the third - 25%. Of the products of the first plant, 60% of the hours are rushing, the second - 70%, and the third - 40%. What is the probability that a purchased watch is in a hurry?

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)