Question

Subtract the following.
$15$ min $24$ sec from $37$ min $18$ sec.

Answer 1

$37$mins$18$secs

$=37$mins$+18$secs

$=36$mins$+1$mins$+18$secs since $1$min$=60$secs

$=36$mins$+60$secs$+18$secs

$=36$mins$+78$secs

$\therefore 36$mins$78$secs$-15$mins$24$secs$=21$mins$54$secs‬