Your aunt and uncle took turns driving on a 580-mile trip that took 10 hours. your uncle drove at a constant speed of 60 mph and your aunt drove a constant speed of 55 mph. how long did each person drive?
a. write the two equations.
b solve the equations and give both answers.

Definition: es. this is a disadvantage or weak point that makes someone or something less effective.

Asays "we are both knaves" and b says nothing. exercises 24–31 relate to inhabitants of an island on which there are three kinds of people: knights who always tell the truth, knaves who always lie, and spies (called normals by smullyan [sm78]) who can either lie or tell the truth. you encounter three people, a, b, and c. you know one of these people is a knight, one is a knave, and one is a spy. each of the three people knows the type of person each of other two is. for each of these situations, if possible, determine whether there is a unique solution and determine who the knave, knight, and spy are. when there is no unique solution, list all possible solutions or state that there are no solutions. 24. a says "c is the knave," b says, "a is the knight," and c says "i am the spy."

Find the maximum value of p= 4x + 5y subject to the following constraints :