One can calculate speed from the given data. The speed is 4.44m/s.
The speed is the ratio of distance and the time taken to cover that distance.
Given is the distance d =4km =4000m and the time taken t 15 min =15 x60 =900 s
Then the speed will be
s = d/t
s = 4000/900
s= 4.44 m/s
Thus, the speed is calculated as 4.44m/s.
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