Hello friend
from cornish to ras laffan is nearly 70-71 kms, and from cornish to al khor is 40-45 Kms. this distance is for city to city but time i cannot tell it will depend up on traffic...but it will take 45 minutes to ras laffan and 30 minutes if you drving a pajero or a civic. because i have gone in that cars thats why other vehicle i dont know