A boat takes 7 hours to cover 273 km upstream and 9 hours to cover 441 km downstream. Find the time taken by the boat to cover 540 km upstream and 459 km downstream if speed of boat in still water is increased by 4 km/h and speed of stream is decreased by 2 km/h.
Upstream speed = 273/7 = 39 km/h Downstream speed = 441/9 = 49 km/h Speed of boat in still water = (39 + 49)/2 = 44 km/h Speed of stream = (49 – 39)/2 = 5 km/h Increased speed of boat in still water = 44 + 4 = 48 km/h Decreased speed of stream = 5 – 2 = 3 km/h Required time taken = 540/(48 – 3) + 459/(48 + 3) = 12 + 9 = 21 hours
Statements: All eleven are twelve.
Some twelve are thirteen.
All thirteen are fourteen
Conclusions: ...
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
In the question below there are three statements followed by two conclusions I and II. You have to take the three given statements to be true even if t...
Statements:
All Paint is Bucket
All Bucket is Plastic
No Plastic is Harmful
Conclusions:
I. Some Paint can be...
Statement:
Some divide are plus.
Only a few plus are minus.
All multiply are minus.
None plus is square. ...
Statements:
Only plateau is mountain
Only a few plateau is river
Few river is hill
Conclusions:
I. Some mo...
Statements:
Some hellos are byes.
Some byes are hi.
All hi are long.
All long are far.
Conclusion:
Statements: Some pins are mirrors.
All mirrors are boxes.
Conclusions:I. Some boxes are pins.
II. Some boxes are mirrors.
Statements: Some tiger are lion.
No cat is elephant.
Statements:
Some guests are hosts
All hosts are invitations
No invitation is a decoration
Conclusion :
I. Some g...
