Question

Ojos del Salado is the highest mountain in Chile, with a peak at about 6900 meters above sea level. The Atacama Trench, just off the coast of Peru and Chile, is about 8100 meters below sea level (at its lowest point).

What elevation is halfway between the peak of Mount Ojos del Salado and the Atacama Trench?

Answer 1

Let

y1---------> is the high of the mountain Ojos del Salado in meters, above sea level

y2---------> is the deep of the Trench in meters below sea level

we know that

$y1=+6,900\ m$

$y2=-8,100\ m$

so

Find the halfway elevation

calculate the distance

$d=\left|y_2-y_1\right|$

substitute the values

$d=\left|-8,100-6,900\right|$

$d=\left|-15,000\right|$

$d=15,000\ m$

Find the midpoint

=15,000/2=7,500\ m

The midpoint is located below the sea level

so

$7,500-6,900=600\ m$

therefore

the answer is

The halfway elevation is about $600\ meters$ below sea level