Search any question & find its solution
Question:
Answered & Verified by Expert
A car moves from A to B with a speed of \( 30 \mathrm{kmph} \) and from B to A with a speed of \( 20 \mathrm{kmph} \).
What is the average speed of the car ?
Options:
What is the average speed of the car ?
Solution:
2531 Upvotes
Verified Answer
The correct answer is:
\( 24 \mathrm{kmph} \)
Given, speed of car from $\mathrm{A}$ to $\mathrm{B}=30 \mathrm{kmph}^{-1}=v_{1}$
Speed of car from $\mathrm{B}$ to $A=20 \mathrm{~km} h^{-1}=v_{2}$
Average speed of car $=\frac{2 v_{1}+v_{2}}{v_{1}+v_{2}}=\frac{2 \times 30 \times 20}{30+20}=\frac{1200}{50}=24$
Average speed of car $=24 \mathrm{kmph}$
Speed of car from $\mathrm{B}$ to $A=20 \mathrm{~km} h^{-1}=v_{2}$
Average speed of car $=\frac{2 v_{1}+v_{2}}{v_{1}+v_{2}}=\frac{2 \times 30 \times 20}{30+20}=\frac{1200}{50}=24$
Average speed of car $=24 \mathrm{kmph}$
Looking for more such questions to practice?
Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.