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10-12-2022
Mathematics

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172. Alex the geologist is in the desert, 10 km from the nearest point N on a long, straight
road. Alex's jeep can do 50 kph on the road, and 30 kph in the desert. Find the shortest
time for Alex to reach an oasis that is on the road (a) 20 km from N; (b) 30 km from N.

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