An algebra book weighs 6 oz less than twice as much as a grammar
book. If 5 algebra books weigh the
same as 8 grammar books, how
much does an algebra book weigh?

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.