(1) Right. Because in the proportional formulas a:b=c:d and b*c=a*d, if the product of the inner term is 1, then the product of the outer term is also 1, that is, the reciprocal.

(2) wrong. From t=s/v, when s is constant, the bigger v is, the shorter t is, that is, the speed is inversely proportional to time.

(3) right. Assuming that Aunt Deng's hourly salary is K and her monthly income is Y, then Y = K * T. That is, the time doubles and her income doubles.

(4) wrong. Y = 2x-5, Y and X are neither directly proportional nor inversely proportional. In direct proportion, x requires doubling, and y also requires doubling; Inverse ratio requires x to be reduced by half and y to be doubled.