exam Maths Puzzle Numerical Ability

A car travels a distance of 1742 miles at an average rate of 40 mph and returns at an average rate of 55 mph. Find the average rate for the round trip to the nearest tenth?

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exam Other Question
x^2+17x+42=0 Determine whether a correlation coefficient of r = –0.405 is significant at the 5% level for a sample size of 22. I need to know if 5 is or is not significant at 5%.