The answer is 1.6 hours.
35.6
3.3
Rounded to the nearest tenth, there can be only one decimal. And that is 7.8
35% as a decimal is 0.35 and rounded to the nearest tenth it is 0.4
11.0
It is 0.0 : the zero after the decimal point is an indication that the number is rounded to the nearest tenth.
The decimal fraction 0.8 is already rounded to the nearest tenth.
When rounded to the nearest tenth the answer is 1.0
2794.0
7.6
57.9