Distance covered= 65-25= 40 Km
Time Taken = 0.5 hour
Speed= 40/0.5= 80 km/hr



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If west means the west of the axis x the velocity equal :

Explanation:
Distance given to travel in south =4m
Distance given to travel in east=3 m
Total distance would be 4+3=7 M
&
Total displacement would be also 7 because he walks in south and east
And not in the same direction.
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The wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.