The outside temperature at an altitude km above ground level in a particular city is

MATHEMATICS · Subjective · CBSE · Mathematics · Relations and Functions · Relations and Functions

Problem

The outside temperature at an altitude

a

km above ground level in a particular city is

T(a)=25-6a\ ^\circ\mathrm{C}

. The altitude of an aeroplane

t

minutes after taking off is

a(t)=12-\frac{60}{t+5}

km. Find the composite function

T\circ a

, and explain what it means.