Answer :
[tex]2\frac{1}{7}*\frac{1}{3}=\frac{15}{7}*\frac{1}{3}=\frac{15*1}{7*3}=\frac{15}{21}=\frac{5}{7}[/tex]
[tex]\frac{5}{7}*60=\frac{5*60}{7}=\frac{350}{7}=42,(857142)min\approx 42.86min[/tex]
[tex]\frac{5}{7}*60=\frac{5*60}{7}=\frac{350}{7}=42,(857142)min\approx 42.86min[/tex]