Question 663548
 It takes my Father 3 hours to plow the our cornfield with his new tractor.
 Using the old tractor it takes me 5 hours.
 If we both plow for 1 hour before I go to school,how long will it take him to finish
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let t = time Dad plows after he goes to school
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Let the completed job = 1; (a plowed field)
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A shared work equation
{{{((t+1))/3}}} + {{{1/5}}} = 1
Multiply by 15, results
5(t+1) + 3 = 15
5t + 5 + 3 = 15
5t = 15 - 8
t = {{{7/5}}}
t = 1.4 hrs or 1 + .4(60) = 1 hr 24 more minutes to finish
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