Microsoft Senior Software Engineer Interview

it was something like - you got 5 camels that need to go 500 miles. They need to drink certain amount of water to go 100 miles. But water is available only now and at the destination. Each camel can carry water need for it for the next 100 miles. How do u transport the camels. The question was not tough but I messed up somewhere in the middle.. any case I could solve it in the end.