How do i solve this word problem?

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

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. what distance from city a is the point where the truck and the car will meet?