Question 273690
JACK USUALLY MOWS HIS LAWN IN 6 HOURS. MARYILYN CAN MOW THE SAME YARD IN 5 HOURS. HOW MUCH TIME WOULD IT TAKE THEM TO MOW THE LAWN TOGETHER?
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Jack's rate: 1/6 job/hr
Marilyn rate: 1/5 job/hr
Together rate: 1/x job/hr
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Equation:
rate + rate = together rate
1/6 + 1/5 = 1/x
Multiply thru by 30x
5x + 6x = 30
11x = 30
x = 30/11 = 2.73 hrs
0.73hr = 0.73(60 minutes) = 43.8 minutes
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Ans: 2 hr and 44 minutes
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Cheers,
Stan H.