Bunuel wrote:

Hillary and Eddy are climbing to the summit of Mt. Everest from a base camp 4,800 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 800 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?

A) 11:00

B) 12:00

C) 12:30

D) 15:00

E) 16:00

Ans: B

Solution:H stopped 800 ft before reaching the final point, time taken to reach 4000 ft= 4000/800= 5hrs.

this means she reached there at 11:00.

speed difference between them is 800-500=300 ft/hr

so by the time H stops they have 1500 ft of distance

so now here we use relative speed formula they both are travelling toward each other with speed of 1000 and 500 total 1500 ft/hr and distance bwn them is 1500 ft so time taken to meet = 1 hr from 11:00

means 12:00 is the answer.

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