exam Maths Puzzle Numerical Ability

2x-y=-4
-3x+y=-9

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a light bulb consumes 2400 watt-hours per day,how long does it take to consume 11200 watt hours

Thank you for this help From a point on a straight road, two cars are driven in opposite directions, one at 58 miles per hour and the other at 62 miles per hour. In how many hours will they be 480 miles apart?