How long would it take for joe to switch the tire on his own
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Al’s job rate is 1 job in 25 minutes or 1/25.

Joe’s job rate is 1 job in J minutes or 1/J.

Together their rate is 1/25+1/J=one job in 15 minutes=1/15.

So the equation is 1/25+1/J=1/15.

Multiply through by 75J:

3J+75=5J so 2J=75 and J=37.5 minutes, if Joe did the job on his own.

by Top Rated User (823k points)

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