Question

Add the following
$5$ hours $8$ seconds and $2$ hours $19$ minutes $55$ seconds.________

Answer 1

$5$ hours $8$ seconds $=5\times 60\times 60+8$ sec $=18008$ sec

$2$ hours $19$ minutes $55$ sec $=2\times 60\times 60+19\times 60+55$ sec $=8395$ sec

Adding $5$ hours $8$ seconds and $2$ hours $19$ minutes $55$ seconds gives $18008+8395=18403$ sec $=7\times 60\times 60+20\times 60+3=7$ hours $20$ min $3$ sec