Question
Ramesh rows in still water at the speed of 8 kmph to go
a certain place and come back. Find his average speed for the whole journey if the river is flowing at a speed of 4kmph?Solution
Ramesh’s speed upstream = 8 – 4 = 4kmph Ramesh’s speed downstream = 8 + 4 = 12kmph Let the distance be x km. ∴ Time taken upstream = x/4 kmph And time taken downstream = x/12 kmph ∴ Average speed = 2x/(x/4+ x/12) = 6 kmph Alternate method: Average speed during whole journey = (U^2-V^2)/U= (8^2-4^2)/8=(64-16)/8=48/8=6kmph
Statements:
Only a few A are B.
No B is C.
All C are Z.
Conclusions:
I. Some A can be B.
II. Some C can...
Statements: Some racks are tables.
Some tables are chairs.
No chair is a book.
Conclusions: I. Some racks are chairs.
<...Statements:a.Some dogs are not rats
b. Some rats are lions
Conclusions:I. Some dogs are not lions
II. Some lions are not dogs
Statements:
Only Book is Pen.
No Book is Pencil.
Some Pencil are Eraser.
Conclusion:
I. Some Eraser can be Pen.<...
Statements: Only books are staplers.
All pencils are books.
All pencils are glasses.
No glass is a jug.
Conclusions: I....
Statements:
Some Cable are Table
No Table are Chair
All Chair are Rack
Conclusions:
I) Â Some Cable are not Rack...
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance...
Statements:
Only a few Triangle are Circle.
Some Circle are Square.
Only Square are Rectangle .
No Circle is a Cubo...
Statements:
Some TVs are laptops.
Some laptops are computers.
All computers are mobiles.
All mobiles are radios.
...
- Statements:
Some second is minute
Mostly minute is hour
All hour is time
Conclusions:
I. Some time is second
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