SOLUTION: In a 10 kilometer race, Bill ran 12 kilometers per hour while Leo ran 10 kilometers per hour. How long did it take for them to be 2/3 of a kilometer apart?

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Question 275106: In a 10 kilometer race, Bill ran 12 kilometers per hour while Leo ran 10 kilometers per hour. How long did it take for them to be 2/3 of a kilometer apart?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Bill is pulling ahead of Leo at the rate of
12+-+10+=+2 km/hr
The problem doesn't change if you think
of Leo as being stationary and Bill moving
at 2 km/hr. Now how long does it take
Bill to get 2%2F3 km from Leo?
t=d%2Fr
t+=+%282%2F3%29%2F2 hr
t+=+1%2F3 hr
In 20 min, they will be 2%2F3 km apart