Lakshya Education MCQs

Question:  a motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. the speed of the stream (in km/hr) is:
Options:
A.10
B.6
C.5
D.4
Answer: Option C
Explanation :

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Question 1.  a man can row a boat at 20 kmph in still water. if the speed of the stream is 6 kmph, what is the time taken to row a distance of 60 km downstream?
  1.    0/6 hours
  2.    27/2 hours
  3.    30 hours
  4.    30/13 hours
Answer: Option D
Explanation :
Question 2.  the time taken by a man to row his boat upstream is twice the time taken by him to row the same distance downstream. if the speed of the boat in still water is 42 kmph, find the speed of the stream?
  1.    12 kmph
  2.    13 kmph
  3.    14 kmph
  4.    15 kmph
Answer: Option C
Explanation :
Question 3.  a man can row 30 km downstream and 20 km upstream in 4 hours. he can row 45 km downstream and 40 km upstream in 7 hours. find the speed of man in still water?
  1.    15 kmph
  2.    10 kmph
  3.    12 kmph
  4.    12.5 kmph
Answer: Option D
Explanation :
Question 4.  a man rows to a place 48 km distant and come back in 14 hours. he finds that he can row 4 km with the stream in the same time as 3 km against the stream. the rate of the stream is:
  1.    1 km/hr. 
  2.    2 km/hr
  3.    1.5 km/hr. 
  4.    2.5 km/hr.
Answer: Option A
Explanation :
Question 5.  a boatman goes 2 km against the current of the stream in 2 hour and goes 1 km along the current in 20 minutes. how long will it take to go 5 km in stationary water?
  1.    2 hr 30 min
  2.    2 hr
  3.    4 hr
  4.    1 hr 15 min
Answer: Option A
Explanation :
Question 6.  the speed of a boat in still water in 22 km/hr and the rate of current is 4 km/hr. the distance travelled downstream in 24 minutes is:
  1.    9.4 km
  2.    10.2 km
  3.    10.4 km
  4.    9.2 km
Answer: Option C
Explanation :

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