document.write( "Question 1134571: Twin​ brothers, Billy and​ Bobby, can mow their​ grandparent's lawn together in 77 minutes. Billy could mow the lawn by himself in 35 minutes less time that it would take Bobby. How long would it take Bobby to mow the lawn by​ himself? \n" ); document.write( "
Algebra.Com's Answer #751996 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
Bobby's rate \"1%2Ft\"\r
\n" ); document.write( "\n" ); document.write( "Billy's rate \"1%2F%28t-35%29\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Combined rate \"1%2Ft%2B1%2F%28t-35%29=1%2F77\"-------------solve for \"t\".
\n" ); document.write( "
\n" );