SOLUTION: One task took 7 minutes (min), a second task took 12 min, and a third task took 21 min. How long did the three tasks take, as a fraction of an hour? I don't understand how

Algebra ->  Numeric Fractions Calculators, Lesson and Practice -> SOLUTION: One task took 7 minutes (min), a second task took 12 min, and a third task took 21 min. How long did the three tasks take, as a fraction of an hour? I don't understand how       Log On


   

Question 326129: One task took 7 minutes (min), a second task took 12 min, and
a third task took 21 min. How long did the three tasks take, as a fraction of an
hour?

I don't understand how to do this?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Sum the times.
T=7%2B12%2B21=40minutes
What fraction of a hour is 40 minutes?
F=40%2F60=2%2F3
.
.
.
It took him 2%2F3 hrs.