Question
A boat travels a certain distance downstream in 72
minutes but takes 3 hours to cover the same distance upstream. The speed of the stream is 15 km/h. If the boat's speed in still water were reduced by 20%, how much time (in minutes) would it take for the boat to travel 236.5 km downstream?Solution
Let the speed of boat in still water be 'x' km/h, respectively. ATQ, D = (x + 15) X 1.2 = 1.2x + 18 .......(i) Also, D = (x - 15) X 3 = 3x - 45 ........(ii) Solving equations (i) and (ii) , we get, 1.2x + 18 = 3x - 45 Or, 1.8x = 65 So, 'x' = (63/1.8) = 35 Therefore, required time = 236.5 ÷ (0.8 X 35 + 15) = (236.5/43) = 5.5 hour = 5.5 X 60 = 330 minutes
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 ...
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at varianc...
Statements :
All oranges are apples.
No apple is a grape.
Conclusions :
I. No orange is a grape.
II. All apples are oranges.
Statements:
Some Facebook are Reels.
All Meta are Reels.
Only a few Reels are Views.
Conclusions:
I. All Reels ...
In the question below are given some statements followed by some conclusions. You have to take the given statements to be true even if they seem to be...
Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at varianc...
Answer the following questions based on the information given below.
If A@B means A is the son of B.
A#B means A is the father of B.
...Statements:
No mountain is plane.
No river is mountain.
Conclusions:
I. No plane is river.
II. All river are ...
Statements:
Some books are copies
Only a few copies are papers
All papers are registers
Only a few registers are windows
Statements:
All trees are plants.
No plant is a flower.
Conclusions:
I. Some plants are not flowers.
II. S...
Relevant for Exams:
