Question
A boat can travel 12 km more in downstream than that in
upstream, in 3 hours while the difference between the time taken by the same boat to travel 180 km and 120 km, in still water, is 4 hours. Find the approximate time taken by the boat to travel 267 km in downstream and 183 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; (180/x) - (120/x) = 4 Or, (60/x) = 4 So, x = 15 Now, 3 x (15 + y) = 3 x (15 - y) + 12 Or, 45 + 3y = 45 - 3y + 12 Or, 6y = 12 So, y = 2 So, downstream speed of the boat = (15 + 2) = 17 km/hr And, upstream speed of the boat = (15 - 2) = 13 km/hr Required time taken = (267/17) + (183/13) ~ (16 + 14) ~ 30 hours
Statement : Some letters are alphabets.
All alphabets are words.
Some letters are consonants.
Conclusion : I. All letters being...
In each of the questions below are given three statements followed by two conclusions numbered I and II. You have to take the given statements to be ...
Statement:Â
All beds are cupboards.
Some beds are tables.
Some tables are pillows.
Conclusion:
I. Some cupboards are...
In the question below there are two conclusions followed by three statements in the options. You have to take the three given statements to be true ev...
Statements:
No Summer is Winter.
Only a few Winter is Autumn
Some Summer are Spring.
Conclusions:
I. All W...
Statements:Â
Only a few Twitter are Meta.
Some Meta are Tiktok.
No Tiktok is Instagram.
Conclusions:
I. Some Twi...
Direction: In the given question a statement is followed by two conclusions numbered I and II. You have to assume everything in the statement to be tru...
Statements:
Some schools are hospitals
Mostly hospitals are courts
Some courts are parlours
Conclusions:
I...
In the question below there are three statements followed by three conclusions I, II and III. You have to take the four given statements to be true eve...
, In the question below some statements are given followed by two conclusions I and II. You have to take the given statements to be true even if they s...
