In a volcano, erupting lava flows continuously through a tube system about 12 kilometers to the sea. assume a lava flow speed of 0.5 kilometers per hour and calculate how long it takes to reach the sea

24 h

Step-by-step explanation:

Formula

speed = distance / time

speed = 0.5 km/h

distance = 12 km

time = ?

then we clear time in the equation

time = distance / speed

time = 12 / 0.5

time = 24 h

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

look a the sides they are perpendicular