there are two point point a is on a mountain which is 5700 m above see level and the point b is in a mine which is 39600m below sea level. find the vertical distance between a and b

**a**is 5700 m above sea level; so the height of the point

**a**= +5700 m

And the point

**b**is 39600 m below sea level; so the height of the point

**b**= -39600 m

Therefore the vertical distance between

**a**and

**b**= $+5700-\left(-39600\right)=5700+39600=45300\mathrm{m}$

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