7 Views

Question : Speed of stream is 4 km/hr and the speed of boat is 11 km/hr. In how much time will the boat cover a distance of 21 km upstream and 45 km downstream?

Option 1: 6 hours

Option 2: 3 hours

Option 3: 4 hours

Option 4: 7 hours


Team Careers360 24th Jan, 2024
Answer (1)
Team Careers360 25th Jan, 2024

Correct Answer: 6 hours


Solution : The speed of the stream is 4 km/hr.
The speed of the boat is 11 km/hr.
Upstream Speed = Speed of boat –Speed of stream
= 11 – 4 = 7 km/h
Upstream distance = 21 km
Time = $\frac{21}{7}$ = 3 hrs
Downstream Speed = Speed of boat + Speed of stream
= 11 + 4 = 15 km/h
Downstream distance = 45 km
Time = $\frac{45}{15}$ = 3 hrs
Total time = 3 + 3 = 6 hrs
Hence, the correct answer is 6 hours.

How to crack SSC CHSL

Candidates can download this e-book to give a boost to thier preparation.

Download Now

Know More About

Related Questions

TOEFL ® Registrations 2024
Apply
Accepted by more than 11,000 universities in over 150 countries worldwide
Manipal Online M.Com Admissions
Apply
Apply for Online M.Com from Manipal University
View All Application Forms

Download the Careers360 App on your Android phone

Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile

150M+ Students
30,000+ Colleges
500+ Exams
1500+ E-books