SOLUTION: A boy runs one k.m. in 12 min. How long will he take to runs 400 m?

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Question 676545: A boy runs one k.m. in 12 min. How long will he take to runs 400 m?
Answer by MathLover1(20855) About Me  (Show Source):
You can put this solution on YOUR website!
A boy runs v=1km%2F12min=1000m%2F12min
How long will he take to runs d=400m

d=v%2At

t=d%2Fv

t=400m%2F%281000m%2F12min%29

t=%28400m%2A12min%29%2F1000m


t=%282%2A12min%29%2F5

t=24min%2F5

t=4.8min