Decide What Values of the Variable Cannot Possibly Be Solutions $\frac { 1 } { 10 } \mathrm { hr }$

question 314

Multiple Choice

Decide what values of the variable cannot possibly be solutions for the equation.
-Frank can type a report in 3 hours. James takes 7 hours to type it. How long will it take the two of them typing together?

• A) \(\frac { 1 } { 10 } \mathrm { hr }\)
• B) \(\frac { 1 } { 21 } \mathrm { hr }\)
• C) \(\frac { 21 } { 10 } \mathrm { hr }\)
• D) \(\frac { 21 } { 4 } \mathrm { hr }\)

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