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What expression is equivalent to 42x-56y

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?