6 weeks until she reaches 60 kilo
The number of permutations of the 26 letters of the English alphabet that do not contain any of the strings fish, rat, or bird is 402619359782336797900800000
Let

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Note that since
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and
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Since

where 
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What we are looking for is the number of permutations of the 26 letters of the alphabet that do not contain the strings fish, rat or bird, or

This link contains another solved problem on permutations:
brainly.com/question/7951365
Step-by-step explanation:
2w+3(2w)=30
8w=30
w=3.75
l=11.25
The sum total of the angles in a triangle is equal to 180° degrees.
Answer:
61.7295 (61.7) miles
If I'm reading this correctly, this is just a simple addition equation. You'd add up 23.4865 and 38.243 to get 61.7295 miles, or 61.7 miles.
Hope I helped! ☺