book Maths Puzzle Numerical Ability

The midpoint of line segment of RQ is P(4, -1). Give two possible coordinates of R and of Q.

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(1) 2x+y=5 Safety Rent-a-Car rents an intermediate-size car at a daily rate of $21.95 plus .19 per mile. City Rentals rent an intermediate-size car for $18.95 plus .21 per mile. For what milage is the cost the same?