Explanation for Question 10 From the Math (Calc) Section on the 2020 March Sat
Now a number 10, we have Louise and Louise was traveling from Sacramento to 2 Portland and it looks as though he stopped to rest for 10 hours. 3 So he had 10 hours of rest out of a total of 143 hours. 4 Right? So total, he spent 143 hours driving slash resting. 5 If 10 of those hours were arrest, then we know that 133 of those 6 hours were driving. And then we're told that his average 7 speed traveling without resting was five miles per hour. 8 So when we don't consider this 10, 9 when we only consider the 33, the 133 miles that he traveled driving, 10 then we know that he went five miles per hour. 11 So how many miles, um, 12 did Louie REM travel? 13 Right? So we know for these 10, he was arresting. 14 So he wasn't actually traveling during those 10. 15 And so they're not going to be important for our calculation because our calculation 16 is strictly how far did Louise travel? 17 And these are the miles that represent the traveling. 18 And now we're trying to get to miles, 19 right? So our goal unit here is miles and 133 20 that's ours, right? So this is an example of a unit analysis 21 question because I'm starting in one unit hours 22 and I'm trying to get to a different unit miles and I can use 23 this conversion factor to get there. 24 My goal now is to cancel out the hours by multiplying by conversion factor. 25 That will leave me with an answer in miles. 26 And if my hours right here are in the numerator, 27 then to get them to cancel, I need to put hours in the denom...