clearly, the fastest has run one complete lap, while the slowest has run only 1/4 of a lap.
Then if they started at the eastern side of the track, after 30 seconds they are at the points E,S,W,N in order of speed, fastest to slowest.
After 30 more seconds, they are at E,W,E,W
After another 30 seconds, they are at E,N,W,S
In a race, each of the four greyhounds run at its own constant speed. They all start at the same point on a circular track and at 30 seconds into the race, while all are still on their first lap, they have spread out so they are at four corners of a square. How many seconds into the race will it be when they are next at the four corners of a square?
A. 60
B. 90
C. 150
D. 210
E. 240
1 answer
1 answer