In the nocturnal house at the zoo, there are 4 bats for every 3 spiders. If there are 112 bats and spiders, how many are bats? How many are spiders

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.