document.write( "Question 687419: John and Jack walk towards each other at the same time from two places that are 100km apart. John walks at 6km/h and Jack 4kn/h. John has a dog that runs at 10km/h and starts together with him. The dog turns back each time when it meets Jack or John. How long has the dog run when these two guys meet each other?
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Algebra.Com's Answer #425287 by ankor@dixie-net.com(22740)\"\" \"About 
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John and Jack walk towards each other at the same time from two places that are 100km apart.
\n" ); document.write( " John walks at 6km/h and Jack 4kn/h.
\n" ); document.write( " John has a dog that runs at 10km/h and starts together with him.
\n" ); document.write( " The dog turns back each time when it meets Jack or John.
\n" ); document.write( " How long has the dog run when these two guys meet each other?
\n" ); document.write( ":
\n" ); document.write( "Let t = time John and Jack walked when they meet
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\n" ); document.write( "Write distance equation, dist = speed * time
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\n" ); document.write( "John's dist + Jack's dist = 100 km
\n" ); document.write( "6t + 4t = 100
\n" ); document.write( "10t = 100'
\n" ); document.write( "t = 100/10
\n" ); document.write( "t = 10 hrs
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\n" ); document.write( "The dog ran for 10 hrs, his speed is 10 km/hr, therefore
\n" ); document.write( "10 * 10 = 100 km was the dist ran by the dog \n" ); document.write( "
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