Почему в этом предложении слово covered переводится как пройдут. Когда само по себе оно так не переводится?

пройдут. - это вольный перевод, чтобы русские поняли
а так переводится, как ПОКРЫТЬ, покрыть путь в 30 км до восхода солнца

"покроют" 30 км (у нас так же говорят))
А перевод слишком вольный.

Не пройдут, а покроют путь в 30 км. Смысл правда не меняется...

А в чем затруднение? До рассвета они пройдут 30 километров. Переводить-то нужно по смыслу, а не по словам.

Просто у слова cover много значений.
Одно из них "преодолевать определенное расстояние". #12

Definition of cover (Entry 1 of 2)
transitive verb

1a : to guard from attack
b(1) : to have within the range of one's guns : COMMAND
The ships were covering approaches to the harbor.
(2) : to hold within range of an aimed firearm
The deputy covered the sheriff who was apprehending the suspect.
c(1) : to afford protection or security to : INSURE
a policy covering the traveler in all kinds of accidents
(2) : to afford protection against or compensation (see COMPENSATION sense 2) for
a policy covering loss by fire
d(1) : to guard (an opponent) in order to obstruct a play
a linebacker assigned to cover the tight end
(2) : to be in position to receive a throw to (a base in baseball)
The shortstop was covering second.
e(1) : to make provision for (a demand or charge) by means of a reserve or deposit
Your balance is insufficient to cover the check.
(2) : to maintain a check on especially by patrolling
motorcycle police covering the highways
(3) : to protect by contrivance or expedient
2a : to hide from sight or knowledge : CONCEAL
cover up a scandal
b : to lie over : ENVELOP
a blanket covering her legs
3 : to lay or spread something over : OVERLAY
Cover the seedbed with straw.
4a : to spread over
Snow covered the hills.
b : to appear here and there on the surface of
a region covered with lakes
5 : to place or set a cover or covering over
Cover the pot.
6a : to copulate with (a female animal)
a horse covers a mare
b : to sit on and incubate (eggs)
7 : to invest with a large or excessive amount of something
covered herself with glory
8 : to play a higher-ranking card on (a previously played card)
9 : to have sufficient scope to include or take into account
an examination covering a full year's work
10 : to deal with : TREAT
material covered in the first chapter
11a : to have as one's territory or field of activity
One sales rep covers the whole state.
b : to report news about
reporters covering the campaign
12 : to pass over : TRAVERSE
Tthe hikers covered 12 miles that day.
13 : to defray the cost of
cover expenses
14 : to place one's stake in equal jeopardy with in a bet
15 : to buy securities or commodities for delivery against (an earlier short sale)
16 : to record or perform a cover of (a song)
intransitive verb

1 : to conceal something illicit, blameworthy, or embarrassing from notice —usually used with up
cover up for a careless coworker
2 : to act as a substitute or replacement during an absence
a stand-in covering for an injured star

К закату они преодолеют 30 км.
Заметил, что это слово чаще используется при поиске или спасении кого- либо, или при исследовательской работе. Cover - крышка, покрытие. Прошли и закрыли этот этап.