How do i convert 2.3 y/min to ft/s

How can (square root of 25) ^2 be rewritten?

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.

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.