Answer
a). 137.16m by 22.86m by 13.716m
b). $4.3\times 10^{3} m^{3}$
Work Step by Step
1 cubit = 0.5 yard
But, 1 yard = 0.9144 m.
So, $ 1 cubit = 0.5 \times 0.9144 m = 0.4572 m.$
a). $300 cubits=300 \times 0.4572 m = 137.16m$
$50 cubits=50 \times .4572 m = 22.86m$
$30 cubits=30 \times 0.4572 m = 13.716m$
So the dimension of the ark is 137.16m by 22.86m by 13.716m
b). Volume = $137.16\times 22.86 \times 13.716 m^{3}$
$=4.3\times 10^{3} m^{3}$