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Find the difference (8ab+a+2) - (3ab+6)

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?

Solve the equation.then check your solution 8=1.88+a