What is the ruling on combining and shortening the Maghrib and Isha prayers for a traveler half an hour after the Maghrib prayer?

It is permissible for a traveler to combine the Maghrib and Isha prayers during the time of either of them, and to shorten the four-rak'ah prayers. Maghrib is prayed as three rak'ahs. For a traveler, when combining prayers by performing them earlier (jama' taqdim), it is a condition that there be no significant间隔 (muwalat) between them; if the interval between them is prolonged, the combination becomes void. However, when combining prayers by delaying them (jama' ta'khir), an interval between the two prayers is permissible.