Walking

Lucie can walk about 3 4/5 miles each hour. How far can she walk in 2 hours 45 minutes?

Correct result:

x =  10.45 mi

Solution:

v=3+4/5=195=3.8 mph t=2+45/60=114=2.75 h  x=v⋅ t=3.8⋅ 2.75=20920=10.45 miv=3 + 4/5=\dfrac{ 19 }{ 5 }=3.8 \ \text{mph} \ \\ t=2 + 45/60=\dfrac{ 11 }{ 4 }=2.75 \ \text{h} \ \\ \ \\ x=v \cdot \ t=3.8 \cdot \ 2.75=\dfrac{ 209 }{ 20 }=10.45 \ \text{mi}

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