Will both teams be able to communicate if their radios have a
range of 4.5 miles?...
Exploration: Two explorers leave a common point. The first travels 5 km north across a plain, then follows a river 15 west of north for 7 km before making camp for the night. The second travels 6 km northeast along a trail while gaining 2.5 km in altitude (as the trail climbs a ridge), and then follows the ridge northward at constant altitude for 4 km before setting up camp.