MathCounts Help

Q: The amount of time it takes to shovel the snow in a parking lot is inversely proportional to the number of men shoveling. If it takes 3 hours for 5 men to complete the job, how many hours would it take 2 men to complete the job? Express your answer as a decimal to the nearest tenth. A: 7.5

Q: A student was supposed to substitute a certain value for x into the expression 2x³. The student thought the expression was (2x)³. If the student's answer was 384 greater than the correct answer, what value of x did the student use? A: 4