Selected MCQ

Current Question
A boat goes downstream at 12 km/h and upstream at 8 km/h. Speed of stream ____.
  • A. 2 km/h
  • B. 3 km/h
  • C. 4 km/h
  • D. 5 km/h
Correct Answer: A
Explanation:
Stream speed = (12−8)/2.
Related Question 1
Ratio of speed of boat to stream is 36:5. Time downstream is 5h 10min. Find upstream time.
  • A. 5h 50m
  • B. 6h
  • C. 6h 50m
  • D. 12h 10m
Correct Answer: C
Explanation:
Use the ratio method for speeds.
Related Question 2
The speed of the boat in still water is 60 km/h, and the current is 20 km/h. Find downstream and upstream speeds.
  • A. 35, 25
  • B. 80, 40
  • C. 40, 60
  • D. 50, 55
Correct Answer: B
Explanation:
Downstream = 80, upstream = 40.
Related Question 3
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 4
The time taken upstream is twice that downstream. Find the speed relation.
  • A. 12 km/h
  • B. 13 km/h
  • C. 14 km/h
  • D. 15 km/h
Correct Answer: C
Explanation:
Solve using the speed ratio method.
Related Question 5
Speed upstream is 60 km/h and downstream is 80 km/h. Find stream speed.
  • A. 10 km/h
  • B. 27 km/h
  • C. 60 km/h
  • D. 55 km/h
Correct Answer: A
Explanation:
Stream speed = (down − up)/2.