A person travels along a straight road for the first half with a velocity ${ v }{ 1 }$ and the second half with velocity
${ v }{ 2 }$. What is the mean velocity of the person?
Time taken by person to travel first half
{ t }_{ 1 } = (d/2) /
{v }_{ 1 }
= d/{2v }_{ 1 }
Time taken by person to travel second half
{ t }_{ 2 } = d/2 / {v }_{ 2 }
d/ {2v }_{ 2 }
