A boy goes from A to B with a velocity of 20 m/min and comes back from B to A
with a velocity of 30 m/min. The average speed of the boy during the whole journey
is
(a) 24 m/min
(b) 25 m/s
(c) Zero
Answers
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1
Answer:
(a)
Explanation:
avg speed = Total Dist./Total Time
Let distance be x
T=Dist/speed
T=x/20. ..(i)
t=x/30. ...(ii)
avg speed= x+x/{(x/20)+(x/30)}
=2x/(5x/60)
=2x×60/5x
=24m/min
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