document.write( "Question 809854: Bob is climbing down a ladder while Roy is climbing up another one. Each ladder has 30 rungs. Bob went down 2 rungs every second while Roy went up 1 rung every second. At some point they were at the same height. Which rung were they on? \n" ); document.write( "

Algebra.Com's Answer #487811 by mananth(16946) $\"\"$ $\"About$

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Bob is climbing down a ladder while Roy is climbing up another one. Each ladder has 30 rungs. Bob went down 2 rungs every second while Roy went up 1 rung every second. At some point they were at the same height. Which rung were they on?\r
\n" ); document.write( "\n" ); document.write( " Bob went down 2 rungs every second
\n" ); document.write( " while Roy went up 1 rung every second.\r
\n" ); document.write( "\n" ); document.write( "they are moving towards each other add up their rates\r
\n" ); document.write( "\n" ); document.write( "2+1=3 rungs/second\r
\n" ); document.write( "\n" ); document.write( "total 30 rungs\r
\n" ); document.write( "\n" ); document.write( "time taken to meet is d/r
\n" ); document.write( "30/3
\n" ); document.write( "=10 seconds\r
\n" ); document.write( "\n" ); document.write( "bob rate = 2 rungs/s . d=rt, 2*10= 20 rungs from top\r
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