Step-by-step explanation:
Hey, there!!
Here,
speed (s)= 20m/s
distance (d)= 1km
= 1000m
now,
we have formula,
putting value,
cancelling the like terms,
Therefore, the time is 50s.
Hope it helps...
Answer: 50 seconds
1km=1000m
Distance/speed=time
1000/20=50
50 seconds
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