Question

Subtract the following
$2$ hours $23$ minutes from $5$ hours $34$ minutes.________

Answer 1

$2$ hours $23$ minutes $=2\times 60+23$ min $=143$ min

$5$ hours $34$ minutes $=5\times 60+34$ min $=334$ min

Subracting $2$ hours $23$ minutes from $5$ hours $34$ minutes gives $334-143=191$ min $=3\times 60+11=3$ hours $11$ min