I think B C and D are all correct.
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According to the table ;
Let's check that in which of the equations it happens.
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A )
Wrong
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B )
Correct.
Thus this option is the correct answer.
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C )
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Wrong
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So the hypothenuse will have a length of x - so using pythagora's theorem you can calculi it easy
x^2 = 25 +16
x = sqrt41
ANSWER: 5 17/23 hrs (5.7391...)
How?
T = 11 hrs
K = 12 hrs
Together = X
1/11x + 1/12x = 1/x
11x/132 + 12x/132 = 132/132
11x x 12x = 23x —> 23x = 132 (divide 132 by 23x)
= 5.73913043 (5 17/23)