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hours and minutes

Source: All-Russian olympiad 1995, Grade 9, First Day, Problem 1

October 20, 2013
algebra proposedalgebra

Problem Statement

A freight train departed from Moscow at xx hours and yy minutes and arrived at Saratov at yy hours and zz minutes. The length of its trip was zz hours and xx minutes. Find all possible values of xx.
S. Tokarev
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