If a 200 pound runner expects to lose 5 pounds during a marathon, what's the MAXIMAL amount of water he should consume i

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If a 200 pound runner expects to lose 5 pounds during a
marathon, what's the MAXIMAL amount of water he should consume in
order to prevent against hyponatremia? Answer should be in
milliliters (ml).
If a 200 pound runner expects to lose 5 pounds during a
marathon, what's the MINIMAL amount of water he should consume to
prevent symptoms of hypohydration? Answer should be in milliliters
(ml).