Question 7
Nick is counting the sheep in a flock as they cross a road. The sheep begin to cross the road at 2 : 00 p.m. and cross at a constant rate of three sheep per minute. After counting 42 sheep, Nick falls asleep. He wakes up an hour and a half later, at which point exactly half of the total flock has crossed the road since 2:00 p.m. How many sheep are there in the entire flock?
A. 630
B. 621
C. 582
D. 624
E. None of the above
**Editorial note for this self-study exercise:** Enter the number of sheep, rather than an option letter.
A. 630
B. 621
C. 582
D. 624
E. None of the above
**Editorial note for this self-study exercise:** Enter the number of sheep, rather than an option letter.