b is two thirds of c. 4a = 5c Work out the ratio a:b:c Give your answer in its simplest form where a, b and c are integers.​

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.