Chapter 1 - Measurement and Problem Solving - Learning Path Questions and Exercises - Exercises - Page 31: 70

$7.98 \times 10^{12} m^{3}$

Width = $118 mi = 118\times 1609.3m=189897.4m$ Length = $307 mi = 307\times 1609.3m=494055.1m$ Depth = $279 ft = 279\times 0.3048m=85.0392m$ So, Volume = $Width\times Length \times Depth$ $= 7.98 \times 10^{12} m^{3}$