Question

a) (11 h 45 min) – (4 h 20 min) =

b) (15 h 30 min) – (2 h 50 min) =

c) (30 min) - (10 min 30 s) =

d) (10h 25min 10s) - (2h 30min 40s) =​

Answer 1

$\boxed{\begin{array}{l}\rm a)\\\sf 11h~45min-4h~20min=7h~25min\\\rm b)\\\sf 15h~30min=14h~90min\\\sf15h~30min-2h~50min=14h~90min-2h~50min=12h~40min\\\rm c)\\\sf 30min=29min~60s\\\sf 30min-10min~30s=29min~60s-10min~30s=19min~50s\\\rm d)\\\sf 10h~25min~10s=9h~84min~70s\\\sf10h~25min~10s-2h~30min~40s\\\sf9h~84min~70s-2h~30min~40s=7h~54min~30s\end{array}}$