417.5 Miles distance
Driving Time: 6 hrs 49 mins
Flight time: 1 hrs 30 mins
Walk time: 142 hrs (Average speed)
Bike time: 39 hrs (Average speed)
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It would be: 20/7 = 2 6/7
In short, Your Answer would be 2 6/7
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Total number of members = 12
Members to choose at a time = 2
This is a combination problem and we are to find the combination of 12 objects taken 2 at a time i.e. we are to find 12C2
12C2 = 66
So, there are 66 ways of selecting a president and vice president.
Therefore, the correct answer is option D
150 because 6 times 5 is 30 then you multiply whats inside the square root thing so you'd get 25, 25 is a perfect square which simplifies to 5 then 5 times 30 is 150.