Selected MCQ

Current Question
A man rows 3 km upstream in 3 hours and 15 km downstream in the same time. Find stream speed.
  • A. 2 km/hr
  • B. 4 km/hr
  • C. 6 km/hr
  • D. 9 km/hr
Correct Answer: A
Explanation:
Using upstream/downstream equations gives 2 km/hr.
Related Question 1
The speed of a man rowing in still water is 15 km/h. If he rows downstream and upstream, find the time relation.
  • A. 10 sec
  • B. 15 sec
  • C. 20 sec
  • D. 12 sec
Correct Answer: D
Explanation:
Based on the speed relation between the stream and still water.
Related Question 2
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 3
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 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
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.