document.write( "Question 170479: Jack usually mows his lawn in 7 hours. Marilyn can mow the same yard in 4 hours. How much time would it take for them to mow the lawn together?
\n" ); document.write( "(Simplify your answer. Type and integer, proper fraction, or mixed number.)
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Algebra.Com's Answer #125863 by stanbon(75887)\"\" \"About 
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Jack usually mows his lawn in 7 hours. Marilyn can mow the same yard in 4 hours. How much time would it take for them to mow the lawn together?
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\n" ); document.write( "Jack DATA:
\n" ); document.write( "Time = 7 hrs/job ; rate = 1/7 job/hr
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\n" ); document.write( "Marilyn = 4 hrs/job ; rate = 1/4 job/hr
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\n" ); document.write( "Together DATA:
\n" ); document.write( "Time = x hrs/job ; rate = 1/x job/hr
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\n" ); document.write( "EQUATION:
\n" ); document.write( "rate + rate = together rate
\n" ); document.write( "1/7 + 1/4 = 1/x
\n" ); document.write( "11/28 = 1/x
\n" ); document.write( "x = 28/11 = 2.545454... hrs
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
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