Tom read a novel for 1 1/4 hours and comic books for 1 2/5 hours.

how long did tom read?

Tom read a novel for 1 1/4 hours and comic books for 1 2/5 hours.

How long did Tom read?

Tom read a novel for 1 1/4 hr  or 1 hr and 15 min.
Tom read a comic book for 1 2/5 hr  or 1 hr and 24 min.

1:15 + 1:24 = 2 hrs and 39 min.

Hope this helps!