Kayti sat down to read one of her books. She

loved to read. Since Kayti was a mouse, her
books were very small, only one-fourth inch
high and one-fifth inch wide! Oh, but there
were wonderful stories in them, no matter
how small they were! Kayti read for 43
minutes, then she stopped to make tea. She
read for another 46 minutes, and then
stopped to have lunch. After lunch she read
for 81 minutes and finished her book. How
long did Kayti read in all? Express your
answer in hours and minutes.

Just add up the three times.

that gives you the number of minutes.
Then change that to hours (divide by 60) and minutes (the remainder)