Afarmer set out to travel on a 170 km stretch of lonely prairie highway at an average speed of 105 km/h. he was more than halfway across when his car broke down and he had to complete the journey on foot. he walked at 6 km/h and the whole trip took 7 hours . how long did he walk? how far did did he walk? plz !

Need to finish my juan wants to build a greenhouse in his back yard. he needs to maximize the ratio of floor area to structure volume in order to provide the most room for plants while minimizing the area to be heated. find the description of the structure that best meets juan’s criteria. a.) a hemisphere with a diameter of 12 feet b.) a cube with a side length of 12 feet c.) a cone with a diameter of 12 feet and a height of 10 feet d.) a square pyramid with a base side length of 12 feet and a height of 9 feet