Question
A boat can travel 16 km more in downstream than that in
upstream, in 8 hours while the difference between the time taken by the same boat to travel 150 km and 130 km, in still water, is 4 hours. Find the approximate time taken by the boat to travel 250 km in downstream and 199 km in upstream.Solution
Let the speed of boat in still water and speed of stream be 'x' km/hr and 'y' km/hr, respectively. According to question; (150/x) - (130/x) = 4 Or, (20/x) = 4 So, x = 5 Now, 8 x (5 + y) = 8 x (5 - y) + 16 Or, 40 + 8y = 40 - 8y + 16 Or, 16y = 16 So, y = 1 So, downstream speed of the boat = (5 + 1) = 6 km/hr And, upstream speed of the boat = (5 - 1) = 4 km/hr Required time taken = (250/6) + (190/4) ~ (42 + 50) ~ 92 hours
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
