Question
It took less than 450 seconds for the child to travel from the first signpost to the second signpost.
Answer:
Yes, the child took less than 450 seconds for the child to travel from the first signpost to the second signpost
Step-by-step explanation:

Distance=speed* time
Distance=2.083*450=937.5 m=0.9375 Km
For the child to travel 800 m, it required only

Therefore, it's proper to conclude that it took less than 450 seconds for the child to travel from the first signpost to the second signpost.