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let the speed is xkm/hr
speed in the direction of wind = x+10
speed in opposite direction of wind =x-10
so average speed=(x+10+x-10)/2
=x
total distance he covered =2*60
=120
time =8hr
so speed = 120/8
=15km/hr
speed in the direction of wind = x+10
speed in opposite direction of wind =x-10
so average speed=(x+10+x-10)/2
=x
total distance he covered =2*60
=120
time =8hr
so speed = 120/8
=15km/hr
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