Mr. bonds math class starts at 11:30 if the class ends at 1:00 how long is his teaching.

11:30 and 1:00

assuming that it is

11:30 AM to 1:00 PM and not 11:30 AM to 1:00 AM

11:30 to 1:00 cannot be directly counted

the hours go like this

1,2,3,4,5,6,7,8,9,10,11,12=AM

then after 12AM then

1,2,3,4,5,6,7,8,9,10,11,2=PM

60 minutes in 1 hour so

11:30=11 hours and 30 mins

how far to 12 AM?

12 AM=12 hours=11 hours and 60 minutes

11 hours and 60 minutes - (11 hours and 30 mins) = 30 minutes

then from 12 AM to 1 PM=1 hour so

time total difference is 1 hour and 30 minutes

his class lasts for 1 hour and 30 minutes because all you have to do is count how long the hours are then subtract 30 minutes and there you go 1 hour and 30 minutes.