Question : A man goes to a place on a bicycle at a speed of 16 km/h and comes back at a lower speed. If the average speed is 6.4 km/h in total journey, then the return speed (in km/h) is:
Option 1: 10
Option 2: 8
Option 3: 6
Option 4: 4
New: SSC CHSL tier 1 answer key 2024 out | SSC CHSL 2024 Notification PDF
Recommended: How to crack SSC CHSL | SSC CHSL exam guide
Don't Miss: Month-wise Current Affairs | Upcoming government exams
Correct Answer: 4
Solution :
Given:
Average speed = 6.4 km/h
Speed while going = $x$ = 16 km/h
Let speed while coming to be $y$ km/h
According to the question:
Average speed = $\frac{2xy}{x+y}$
⇒ 6.4 = $\frac{2×16×y}{16+y}$
⇒ 102.4+6.4$y$ = 32$y$
⇒ 102.4 = 32$y$–6.4$y$
⇒ 102.4 = 25.6$y$
$\therefore y$ = $\frac{102.4}{25.6}$ = 4 km/h
Hence, the correct answer is 4.
Related Questions
Know More about
Staff Selection Commission Combined High ...
Result | Eligibility | Application | Admit Card | Answer Key | Preparation Tips | Cutoff
Get Updates BrochureYour Staff Selection Commission Combined Higher Secondary Level Exam brochure has been successfully mailed to your registered email id “”.