Book Maths Puzzle Time Distance and Speed

An airplane flew for 8 hours at an airspeed of x miles per hour (mph), and for 7 more hours at 325 mph. If the average airspeed for the entire flight was 350 mph, which of the foll

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Book Other Question

Leo is 38 years older than Adam. Five times Adam`s age, when decreased by 5 is 1 more than Leo`s age. How old is each. I have to correct the questions I did wrong on a test. I am not sure what I did wrong. Here is how I did the problem.

3x^2-13x-10

I said (3x-10)(1x-1)

Help!