A man covers the journey from station A to station B at a uniform speed of 36 kmph and returns to A with a uniform speed of 45 kmph, his average speed for the whole journey is:
A. 40 kmph
B. 40.5 kmph
C. 41 kmph
D. 42 kmph
Answer: Option A
Solution(By Examveda Team)
Average speed for this case is given by, $$ {\frac{{2xy}}{{x + y}}} ,$$ where X and Y are two different speeds. Average speed, $$\eqalign{ & = {\frac{{2 \times 36 \times 45}}{{36 + 45}}} \cr & = \frac{{36 \times 90}}{{81}} \cr & = 40\,\,{\text{kmph}} \cr} $$Related Questions on Speed Time and Distance
A. 48 min.
B. 60 min.
C. 42 min.
D. 62 min.
E. 66 min.
A. 262.4 km
B. 260 km
C. 283.33 km
D. 275 km
E. None of these
A. 4 hours
B. 4 hours 30 min.
C. 4 hours 45 min.
D. 5 hours
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