The total age of a woman and her son is 51 years. three years ago, the woman was eight times as old as her son. how is old is her son now? algebra question

Restrictions on f(x) = 1/x+5 and g(x) = x-2

Solutions for 2x+7 less than or equal to 3x-5

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?