Answer
Александр
The correct choice:
1.2 hours.
In one hour, the first student solves 1 / 2 of the contest task, and the second student solves 1 / 3 of the contest task.
Together in one hour they solve:
½ + 1/3 = 5/6 of the contest task.
Thus, students will need:
1 / (5/6) = 1.2 hours.
Answer: 1.2 hours.