CLEAR
Toprankers-Info

+91 7676564400

Mobile App

Get it on Google Play
Discussions
Select Date
Tags:

Articles

Discussions
Submit Discussion
Shashank Shah

· started a discussion

· 1 Months ago

Please help (Question: 285157.0 )

Can any1 tell how did we solve this equation

Question:

At his normal speed, Ravi can go 18 km downstream in flowing river in 9 hours less than the same distance upstream. The downstream journey would take 1 hour less than what the upstream journey would take provided he doubles his rate of rowing. Find the speed of the river (in km/h)?

Options:
A)

5

B)

323    

C)

625    

D)

None of these

Solution:

Ans: (d)

  

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
From 1st equation, we get
x^2-y^2=4y _________(a)
4x^2-y^2=36y _________(b)
Now, (a)-(b),
x^2=32y/3
Put the value of x^2 in (a), we get y=20/3
Keep Learning with Us
Best Wishes
Team Toprankers
-logo
We at aim to provide most comprehensive content & test for practice which is carefully divided into various chapters and topics to help you focus on your weak areas.Our Practice mock test gives you unmatched analytics to help you realize your strong areas,time management and improvement areas.Our Short & Crisp notes on each topic will help you to quickly revise the topic along with the tips & tricks of the exams.
More About
-Info
-Info

Mobile App

Get it on Google Play
About Us Campus Ambassador Careers Contact Us Refund Policy

All Rights Reserved Top Rankers

User Policy
Disclaimer
Terms & Conditions