Question

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Answer 1

Answer: 20KM/HR

Explanation:

v1= 30km/hr

v2= 15km/hr

s= 2x

T= time for whole trip

t1= time while going

t2= time while coming

v=s/t

  =2x/t1+t2

  =2x/x/30+x/15   (time = distance/speed)

  =2x/3x/30     (taking lcm)

  =20km/hr

 

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