1. Basaltic lava flows (those referred to as low viscosity flows) can travel 1-10 km/hr (0.6- 6 mi/hr) depending on the steepness of the slope of the land. Hawai'ian neighborhoods have been covered by lavas (or threatened to be covered by lava) that erupted from the Pu'u O'o vent. The vent was only 15 km (9.3 mi) from the town of Kalapana and 20 km (12.6 mi) from the town of Pahoa. Given the lava flow rates, how much time would civil defense officials (the people who decide if evacuations are necessary) have to evacuate a town if the lava flows were moving at 10 km/hr? (note 1 mi = 1.6 km)?