A car covers the first half of a certain distance with a speed V1 and the second half with a speed V2. Find the average speed during the whole journey.
Correct answer: B. Option B
- A. Option A
- B. Option B
- C. Option C
- D. Option D
- E. Option E
Explanation
Average Velocity = 2V1V2/(V1+V2) Let the total distance be x. So time is taken to cover first half =(x/2)/v1=x/(2v1) Time taken to cover second half=(x/2)/v2=x/(2v2) Now Average velocity=Total Distance/Total time = x/((x/2v1)+(x/2v2)) = 2v1v2/v1+v2
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