The number of hours, h, it takes for a block of ice to melt varies inversely as the temperature, t. If it takes 2 hours for a square inch of ice to melt at 70 degrees, find the constant of proportionality

For inverse variation, h = k/t, so the constant is k = ht. Using h = 2 hours and t = 70 degrees gives k = 2 × 70 = 140. The constant of proportionality is 140, which is choice b.

AI-written and checked against the verified answer.