document.write( "Question 777952: A can do a piece of work in 7 days and 9 hours each and B can do it in 6 days of 7 hours each. How long will they take to do it, working together 8 2/5 hours? \n" ); document.write( "
Algebra.Com's Answer #474444 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! A can do a piece of work in 7 days and 9 hours each and B can do it in 6 days of 7 hours each. How long will they take to do it, working together \n" ); document.write( "------------------------------- \n" ); document.write( "A DATA: \n" ); document.write( "time = 63 hrs/job ; rate = 1/63 job/hr \n" ); document.write( "----------------------- \n" ); document.write( "B DATA: \n" ); document.write( "time = 42 hrs/job ; rate = 1/42 job/hr \n" ); document.write( "--------- \n" ); document.write( "Together DATA: \n" ); document.write( "time = x hrs/job ; rate = 1/x job/hr \n" ); document.write( "------------------ \n" ); document.write( "Equation: \n" ); document.write( "rate + rate = together rate \n" ); document.write( "1/63 + 1/42 = 1/x \n" ); document.write( "42x + 63x = 42*63 \n" ); document.write( "------ \n" ); document.write( "105x = 2646 \n" ); document.write( "x = 25.02 hrs (hrs to do the job together) \n" ); document.write( "=================== \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( "=================== \n" ); document.write( " |