<span>15000 feet
The height of Mt. Whitney is listed as 14,505 feet. To round this figure to the closest thousand, we examine the hundreds digit, which is 5. According to the rounding rule, "5 or above, round up, 4 or below, round down". Given that the digit is 5, we round up to yield 15000 feet</span>
Time required equals 66 2/3 minutes, which is equivalent to approximately 1.11 hours.
T<span>he area of a figure signifies the measure of space within a two-dimensional shape, typically expressed as square units based on the figure's dimensions.
For instance, with a shape having dimensions of k, its area can be given by

.
</span>
<span>Consider that one similar figure possesses an area nine times that of another.
As these figures are similar, their areas correspond to the proportionality of their dimensions.
Let the smaller shape's dimensions be k, while the larger is p times the dimensions of the smaller shape. The smaller shape's area is

and the larger shape's area is

.
Now, knowing the larger figure's area is nine times the area of the smaller figure, we have:

</span>
Thus, the dimensions of the larger figure must be 3 times those of the smaller figure.
Millie possesses a total of 170 cubes
170/10=17 trains