Before lunch, a painter can paint a wall at a rate of r square feet per minute. The same painter, after lunch and a cup of coffee, can paint the same wall at a rate r + 1 square feet per minute, and the same wall would be finished in 30 seconds less time. What is the value of r?\nOptions:\n(A) 1/3\n(B) 3\n(C) 1/2\n(D) 1\n(E) 2 Think first, then make a decision. Some random thoughts:
User
Convert 30 seconds to 1/2 minute\nEquation: 1/r = 1/(r + 1) + 1/2\nPlug options into the equation:\nD fits: 1/1 = 1/(1 + 1) + 1/2 So the answer is (D).
Assistant