Task: Question Answering
Input (English): Problem: hillary and eddy are climbing to the summit of mt. everest from a base camp 4,900 ft from the summit. when they depart for the summit at 06: 00, hillary climbs at a rate of 800 ft / hr with eddy lagging behind at a slower rate of 500 ft / hr. if hillary stops 900 ft short of the summit and then descends at a rate of 1,000 ft / hr, at what time do hillary and eddy pass each other on her return trip ?
Options: a. 10.0, b. 11.0, c. 13.0, d. 12.0, e. 14.0
Output (English): d