Help please

7/120  hours/miles  x  1400 miles = 81.67 hrs

The van traveled at 120 miles in 7 hours, how long would it take to travel 1400 miles at the same speed?

$\begin{array}{rcll} \dfrac{120\ \text{miles}} {7\ \text{hour} } \cdot x &=& 1400\ \text{miles} \\\\ x &=& 1400\ \text{miles} \cdot \dfrac {7\ \text{hour} } {120\ \text{miles}} \\\\ x &=& 1400 \cdot \dfrac {7\ \text{hour} } {120} \\\\ x &=& \dfrac{1400}{120} \cdot 7\ \text{hour} \\\\ x &=& \dfrac{140}{12} \cdot 7\ \text{hour} \\\\ x &=& \dfrac{140\cdot 7}{12} \ \text{hour} \\\\ x &=& \dfrac{980}{12} \ \text{hour} \\\\ x &=& 81\ \dfrac{2}{3} \ \text{hour} \\\\ x &=& 81\ \text{hour} + \dfrac{2}{3}\ \text{hour} \cdot \dfrac{60\ \text{minutes} } {1\ \text{hour} }\\\\ x &=& 81\ \text{hour} + \dfrac{2}{3} \cdot 60\ \text{minutes} \\\\ x &=& 81\ \text{hour} + \dfrac{120}{3}\ \text{minutes} \\\\ x &=& 81\ \text{hour} + 40\ \text{minutes} \\\\ \end{array}$