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Let speed of boat in still water and speed of boat in upstream be ‘9x’ km/h and ‘5x’ km/h, respectively. Speed of stream = 9x – 5x = 4x km/h Speed of boat in downstream = 9x + 4x = 13x km/h So, 13x = 390/5 = 78 Or, x = 6 Speed of boat in still water = 9 × 6 = 54 km/h Desired time = 18/54 = 20 minutes
Statements:
All gold are silvers.
All silvers are diamonds.
Some diamonds are ruby
No ruby is silver.
Statements:
Only a few Triangle are Circle.
Some Circle are Square.
Only Square are Rectangle .
Statements:
Some sheep are bull
Only a few bull are cow
No bull is dog
Conclusions:
I. Some dog are not cow
II. All bull can be cow
Statements:
All pens are papers.
Some papers are not books.
All books are pencils.
Conclusions:
Statement:
Only a few P are Q
Only a few Q are P
Conclusion:
Statements: Some doors are windows.
All houses are windows.
No mirror is a door.
Conclusions: I. Some doors are mirror
...Who is son of U?
Statements
Only a few A is B
No B is C
Only a few C is D
Some D is E
Conclusions:
I). No A is C
...Statements:
Some hangers are cloths.
All cloths are drawers.
Some drawers are almirahs.
Conclusions :
