1 View

Question : A man travels 50 km at 25 km/hr, the next 40 km at 20 km/hr, and then 90 km at 15 km/hr. His average speed is:

Option 1: 18 km/hr

Option 2: 25 km/hr

Option 3: 20 km/hr

Option 4: 15 km/hr


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

Correct Answer: 18 km/hr


Solution : Given:
A man travels the first 50 km at 25 km/hr, the next 40 km at 20 km/hr and the last 90 km at 15 km/hr.
Time taken to travel 50 km = $\frac{50}{25}$ = 2 hours
Time taken to travel 40 km = $\frac{40}{20}$ = 2 hours
Time taken to travel 90 km = $\frac{90}{15}$ = 6 hours
Total distance = (50 + 40 + 90) = 180 km
Total time = (2 + 2 + 6) = 10 hours
Average speed $=\frac{\text{Total distance}}{\text{Total time}}=\frac{180}{10}=$ 18 km/hr
Hence, the correct answer is 18 km/hr.

SSC CGL Complete Guide

Candidates can download this ebook to know all about SSC CGL.

Download EBook

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