Estimate how many times greater 5.5 X 10 to the 18th exponent is than 8 x 10 to the 17th exponent round to the nearest tenth

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?

Need asap. solve for the following inequality

What is the value of x? enter your answer in the box.