Question
Two trains ‘A’ and ‘B’ of length 480 metres and 320
metres respectively are travelling towards each other. Ratio of speed of ‘A’ to ‘B’ is 2:3. If the trains take 32 seconds to cross each other from the time they meet each other, then find the average of speeds (in km/h) of trains ‘A’ and ‘B’.Solution
Let the speed of ‘A’ and ‘B’ be ‘2y’ and ‘3y’ m/s respectively.
Relative speed = 2y + 3y = ‘5y’ m/s
ATQ,
5y × 32 = 480 + 320
⇒ 160y = 800
⇒ y = 5
Therefore, required average = (2y + 3y) ÷ 2
= 2.5y = 2.5 × 5 = 12.5 m/s = 12.5 × (18/5) = 45 km/h
Statement:
Only a few clock are timer
Only timer is needle
No clock is watch.
Conclusion:
- Two statements are given followed by three conclusions numbered I, II, and III assuming the statements to be true, even if they seem to be at variance with...
Statements:
Some Venice are Godot.
Some Milan are Godot.
Some Italy are Milan.
Conclusions:
I. Some Venice are defini...
- In the question below there are three statements followed by three conclusions I, II and III. You have to take the three given statements to be true even i...
Statements: Some cubs are puppies.
No puppy is a calf.
All kittens are puppies.
Conclusions: I. At least some cubs are calves.
Two statements are given followed by three conclusions numbered I, II, and III assuming the statements to be true, even if they seem to be at variance ...
Statements: All malware are spyware.
All spyware are viruses.
Conclusions: I....
Statement:
Only a few Hills are River.
No River are Sea.
Conclusion:
I. Some Hills are not Sea.
II. Some Hills...
Some mobiles may not be papers. Some dusters are not calculators
Statement:
I) Some cricket are hockey
II) Some hockey are golf
III) All golf are game
IV) No game is chess
Conc...
Relevant for Exams:
