A cargo plane flew from the US across the Atlantic at 280 mph, and flew back to the US at 300 mph. Given that the first trip took two hours longer, how long was the return trip?

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.