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01 Nov 2023, 06:54
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
65% (02:44) correct
35%
(02:15)
wrong
based on 144
sessions
History
Date
Time
Result
Not Attempted Yet
A person rowing a boat against a river current got from point A to point B in 4 hours. It took him 2 hours to get from point B to point A rowing along the current. How long would it take him to row the same distance as between A and B on a lake with no current?
(A) 2h 30 min
(B) 2h 40 min
(C) 3h
(D) 3h 15 min
(E) 3h 20 min
(A) 2h 30 min
(B) 2h 40 min
(C) 3h
(D) 3h 15 min
(E) 3h 20 min
01 Nov 2023, 07:40
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Bunuel
OA IS B.
The relative speed of boat will increase if it is going with the current and the relative speed will decrease if it is going against it.
We can solve it by below method.
Posted from my mobile device
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03 Nov 2023, 01:34
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Bunuel
Let speed of boat be 's' and speed of current be 'x'
first case: 4=d/(s-x)
second case: 2=d/(s+x)
Solving 2 cases we get: s=3x
Now, let time taken for same distance with current be t
t=d/s= d/3x
Solving first case and new equation we get
t=2.6..
t= 2 hrs 40 min
