Question

Subtract the following
$1$ minute $15$ seconds from $4$ minutes $25$ seconds._______

Answer 1

$1$ minutes $15$ seconds $=1\times 60+15$ sec $=75$ sec

$4$ minutes $25$ seconds $=4\times 60+25$ sec $=265$ sec

Subracting $1$ minutes $15$ sec from $4$ minutes $25$ seconds gives $265-75=190$ sec $=3\times 60+10=3$ min $10$ sec