SATHEE: Quantitative Aptitude Ques 587

Quantitative Aptitude Ques 587

Question: The speed of the current is 5 km/h. A motorboat goes 10 km upstream and back again to the starting point in 50 min. The speed of motorboat in still water is

Options:

A) 20 km/h

B) 26 km/h

C) 28 km/h

D) 25 km/h

Show Answer

Answer:

Correct Answer: D

Solution:

Let speed of boat be x km/h.

$ \therefore $ Upstream speed of boat $ =(x-5),km/h $ Downstream speed of boat $ =(x+5) $ $ \frac{10}{x-5}+\frac{10}{x+5}=\frac{50}{60} $

$ \Rightarrow $ $ 10( \frac{x+5+x-5}{x^{2}-5^{2}} )=\frac{50}{60} $

$ \Rightarrow $ $ 6\times 2\times 2x=x^{2}-25 $

$ \Rightarrow $ $ x^{2}-25-24x=0 $

$ \Rightarrow $ $ x^{2}+25x+x-25=0 $

$ \Rightarrow $ $ (x-25)(x+1)=0 $

$ \Rightarrow $ $ x=25,km/h $

BETA

Privacy Policy

Powered by Prutor@IITK

sathee@iitk.ac.in

Media coverage of SATHEE

Play Store

App Store

The Ministry of Education has launched the SATHEE initiative in association with IIT Kanpur to provide free guidance for competitive exams. SATHEE offers a range of resources, including reference video lectures, mock tests, and other resources to support your preparation. Please note that participation in the SATHEE program does not guarantee clearing any exam or admission to any institute.

Quantitative Aptitude Ques 587

Question: The speed of the current is 5 km/h. A motorboat goes 10 km upstream and back again to the starting point in 50 min. The speed of motorboat in still water is

Options:

Answer:

Solution:

Bank Preparation

Bank Courses

NCERT Books

Important Resources

Forum