Mathematics
Average / Arithmetic Mean
A vehicle covers equal distances at 44 km/h and 66 km/h. What is its average speed?
A. 52.8 km/h
B. 54.8 km/h
C. 56.8 km/h
D. 50.8 km/h
Correct Answer: A
For equal distances, average speed = 2uv/(u+v) = 52.8 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle covers equal distances at 42 km/h and 63 km/h. What is its average speed?
A. 52.4 km/h
B. 50.4 km/h
C. 48.4 km/h
D. 54.4 km/h
Correct Answer: B
For equal distances, average speed = 2uv/(u+v) = 50.4 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle covers equal distances at 40 km/h and 60 km/h. What is its average speed?
A. 46 km/h
B. 48 km/h
C. 50 km/h
D. 52 km/h
Correct Answer: B
For equal distances, average speed = 2uv/(u+v) = 48 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle covers equal distances at 38 km/h and 57 km/h. What is its average speed?
A. 43.6 km/h
B. 47.6 km/h
C. 45.6 km/h
D. 49.6 km/h
Correct Answer: C
For equal distances, average speed = 2uv/(u+v) = 45.6 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle covers equal distances at 36 km/h and 54 km/h. What is its average speed?
A. 47.2 km/h
B. 41.2 km/h
C. 45.2 km/h
D. 43.2 km/h
Correct Answer: D
For equal distances, average speed = 2uv/(u+v) = 43.2 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle covers equal distances at 34 km/h and 51 km/h. What is its average speed?
A. 44.8 km/h
B. 42.8 km/h
C. 38.8 km/h
D. 40.8 km/h
Correct Answer: D
For equal distances, average speed = 2uv/(u+v) = 40.8 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle covers equal distances at 32 km/h and 48 km/h. What is its average speed?
A. 36.4 km/h
B. 42.4 km/h
C. 40.4 km/h
D. 38.4 km/h
Correct Answer: D
For equal distances, average speed = 2uv/(u+v) = 38.4 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle covers equal distances at 30 km/h and 45 km/h. What is its average speed?
A. 34 km/h
B. 38 km/h
C. 40 km/h
D. 36 km/h
Correct Answer: D
For equal distances, average speed = 2uv/(u+v) = 36 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle travels for equal time intervals at 57 km/h and 68 km/h. What is its average speed?
A. 60.5 km/h
B. 66.5 km/h
C. 64.5 km/h
D. 62.5 km/h
Correct Answer: D
For equal time, average speed = (57+68)/2 = 62.5 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle travels for equal time intervals at 54 km/h and 66 km/h. What is its average speed?
A. 62 km/h
B. 58 km/h
C. 64 km/h
D. 60 km/h
Correct Answer: D
For equal time, average speed = (54+66)/2 = 60 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle travels for equal time intervals at 51 km/h and 64 km/h. What is its average speed?
A. 61.5 km/h
B. 59.5 km/h
C. 57.5 km/h
D. 55.5 km/h
Correct Answer: C
For equal time, average speed = (51+64)/2 = 57.5 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle travels for equal time intervals at 48 km/h and 62 km/h. What is its average speed?
A. 57 km/h
B. 55 km/h
C. 53 km/h
D. 59 km/h
Correct Answer: B
For equal time, average speed = (48+62)/2 = 55 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle travels for equal time intervals at 45 km/h and 60 km/h. What is its average speed?
A. 56.5 km/h
B. 52.5 km/h
C. 54.5 km/h
D. 50.5 km/h
Correct Answer: B
For equal time, average speed = (45+60)/2 = 52.5 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle travels for equal time intervals at 42 km/h and 58 km/h. What is its average speed?
A. 54 km/h
B. 48 km/h
C. 50 km/h
D. 52 km/h
Correct Answer: C
For equal time, average speed = (42+58)/2 = 50 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle travels for equal time intervals at 39 km/h and 56 km/h. What is its average speed?
A. 49.5 km/h
B. 47.5 km/h
C. 45.5 km/h
D. 51.5 km/h
Correct Answer: B
For equal time, average speed = (39+56)/2 = 47.5 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle travels for equal time intervals at 36 km/h and 54 km/h. What is its average speed?
A. 45 km/h
B. 47 km/h
C. 49 km/h
D. 43 km/h
Correct Answer: A
For equal time, average speed = (36+54)/2 = 45 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle travels for equal time intervals at 33 km/h and 52 km/h. What is its average speed?
A. 46.5 km/h
B. 44.5 km/h
C. 42.5 km/h
D. 40.5 km/h
Correct Answer: C
For equal time, average speed = (33+52)/2 = 42.5 km/h.
Mathematics
Average / Arithmetic Mean
A vehicle travels for equal time intervals at 30 km/h and 50 km/h. What is its average speed?
A. 44 km/h
B. 40 km/h
C. 42 km/h
D. 38 km/h
Correct Answer: B
For equal time, average speed = (30+50)/2 = 40 km/h.
Mathematics
Average / Arithmetic Mean
The average of x−6, x−2, x+2, and x+6 is 19. What is x?
A. 21
B. 19
C. 23
D. 17
Correct Answer: B
The offsets sum to zero, so the average of the four expressions equals x.
Mathematics
Average / Arithmetic Mean
The average of x−6, x−2, x+2, and x+6 is 18. What is x?
A. 22
B. 20
C. 16
D. 18
Correct Answer: D
The offsets sum to zero, so the average of the four expressions equals x.