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Time taken to travel x km = x/60
time taken to travel 2x km= 2x/40
 Total distance traveled = x+2x=3x km
 Total time taken= x/60+x/20=4x/60=x/15 hrs
  Average speed= 3x/(x/15)
                          =45 km/h
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Total distance= 3x

time for first=x/60

time for second=2x/40

totaltime= x/60+2x/40 =8x/120

average speed= total distance/total time taken

                     =3x/8x * 120=90/2
                     =45 km/hr
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