There were n signers of the declaration of independence. the oldest was benjamin franklin, who was y years old. 7 is 10% of y. what was franklin’s age?

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.