Fastest horsemen quiz - I can't understand the quiz

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Hi all quiz game gurus,

I have got a "Horsemen" quiz which I could not understand. Could any
one please give me a clear explaination/hint to the answer.

Many thanks in advance.

Here comes the quiz:

Two horsemen started out at daybreak. They travelled the same distance
and arrived at their destination at the same time. A rode twice as
long as B rested and B rode for three times as long as A rested for.
Who rode the fastest?