$5000 is invested in an Account which offers 2.125% interest, compounded continuously. How long will it take for the initial investment to double? Round your answer to the nearest year.

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.