A sight-seeing boat travels at an average speed of 19 miles per hour in the calm water of a large lake. The same boat is used for sight-seeing in a nearby river. In the river, the boat travels 3.1 miles downstream (with the current) in the same amount of time it takes to travel 1.6 miles upstream (against the current). Find the current of the river.

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.