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Jeeper by the Dozen

An army jeep covers a certain patrol in 78% of the time required by a command car, which can cover the same distance in 47% of the time required by a foot patrol. If the foot patrol can complete 7 patrols in 4 hours, how much of the patrolling could the jeep do in the same time?

Solution:

Source: W.C. Eddy's Wartime Refresher in Fundamental Mathematics, 1945, p. 85-86