Selected MCQ

Current Question
A person covers a distance at 40 km/h and returns at 60 km/h. Average speed is ____.
  • A. 48 km/h
  • B. 50 km/h
  • C. 45 km/h
  • D. 52 km/h
Correct Answer: A
Explanation:
Average = 2ab/(a+b) = 48 km/h.
Related Question 1
If a person travels half distance at 40 km/h and half at 60 km/h, average speed is ____.
  • A. 48 km/h
  • B. 50 km/h
  • C. 52 km/h
  • D. 55 km/h
Correct Answer: A
Explanation:
Harmonic mean = 48 km/h.
Related Question 2
If a person covers 150 km in 3 hours, his speed is ____.
  • A. 40 km/h
  • B. 45 km/h
  • C. 50 km/h
  • D. 55 km/h
Correct Answer: C
Explanation:
Speed = 150/3 = 50 km/h.
Related Question 3
Asghar travels to the office and returns at different speeds. What is the total distance?
  • A. 3000 m
  • B. 7500 m
  • C. 3750 m
  • D. 7000 m
Correct Answer: C
Explanation:
Average speed formula applied.
Related Question 4
The speed of the boat in still water is 5 km/h. It travels upstream and downstream the same distance. Find stream speed.
  • A. 5 km/h
  • B. 8 km/h
  • C. 10 km/h
  • D. 15 km/h
Correct Answer: A
Explanation:
Equal time implies that stream speed equals still-water speed.
Related Question 5
If a person walks 4 km/h for 2 hours, how much distance does he cover?
  • A. 6 km
  • B. 8 km
  • C. 10 km
  • D. 12 km
Correct Answer: B
Explanation:
Distance = 4×2 = 8 km.