question:  How was Queazy able to determine how long the trio were floating around in space before waking?
context: Queazy discharged their tremendous inertia into the motive-tubes in such a manner that the big, powerful ship was moving at the same rate as the asteroid below—47.05 miles per second. "She checks down to the last dimension," Bob chortled, working with slide-rule and logarithm tables. While Queazy—so called because his full name was Quentin Zuyler—dropped the ship straight down to the smooth surface of the asteroid, and clamped it tight with magnetic grapples, Bob flung open the lazarette, brought out two space-suits. Moments later, they were outside the ship, with star-powdered infinity spread to all sides. And if The Interplanetary Hauling & Moving Co., hadn't been about to go on the rocks (chiefly due to the activities of Saylor & Saylor, a rival firm) neither Bob nor Queazy would have thought of sending an answering ethergram to Burnside stating that they would fill the order. And yet, if by some chance there was such a rigidly specified asteroid, their financial worries would be over. For there are literally millions of asteroids in the asteroid belt, and they had been out in space only three weeks. Now that he and Queazy had found the asteroid, they were desperate to get it to its destination, for fear that the Saylor brothers might get wind of what was going on, and try to beat them out of their profits. Now they scuffed along the smooth-plane topside of the asteroid, the magnets in their shoes keeping them from stepping off into space. The radiations from the sundered molecules traveled back up the beams to the atomic-whirl spectroscope. He and Queazy caught up with her on the side of the asteroid they hadn't yet examined. The big ship had landed, and little blue sparks crackled between the hull and the asteroid as the magnetic clamps took hold. A few seconds later, the airlocks swung down, and five men let themselves down to the asteroid's surface and stood surveying the three who faced them.
output:  From the chronometer
options:  From the chronometer  By how much fuel was left in their ship  From how much oxygen was left in their suits  By his declared level of hunger