Question 1041146

Ralph can lay down a floor tile in 5 seconds. Bob can lay down a floor tile in 4 seconds. If both boys work together, how many seconds would it take them to install 450 floor tiles?
<pre>Ralph takes 2,250 seconds, alone, while Bob takes 1,800 seconds, alone
Time both take, working together: {{{highlight_green(matrix(1,2, "1,000", seconds))}}}