9 Views

Question : A thief running at a speed of ‘$x$’ km/hr is chased by a policeman running at a speed of 10 km/hr. If the thief is ahead by 100 metres, the policeman catches the thief after 3 minutes. At what speed is the thief running (‘$x$’ being the unknown speed)?

Option 1: 4 km/hr

Option 2: 8 km/hr

Option 3: 10 km/hr

Option 4: 6 km/hr


Team Careers360 23rd Jan, 2024
Answer (1)
Team Careers360 25th Jan, 2024

Correct Answer: 8 km/hr


Solution : Let the speed of the thief be $x$ km/hr.
Speed of the policeman = 10 km/hr
Time taken by a policeman to catch the thief = 3 minutes = $\frac{1}{20}$ hr
Relative distance to be covered by policeman = 100 metres = 0.1 km
So, Relative speed × Relative time = Relative distance
$⇒(10-x) × \frac{1}{20} = 0.1$
$⇒(10-x) = 2$
$\therefore x= 8$
Hence, the correct answer is 8 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