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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I have tried 3 different algebra tutors, to no answer. Suppose a cost benefit model is given by y= 2845 over 100-x . Where y is the cost for removing x percent of a given a pollutant can be removed for $23,000? Choices are: 114.1%, 89%, 8.9%, 447% Given that a set of data has a constant ratio of 8 and an initial value of 6, what is the rate of increase k?