Jim decides he wants to practice for a marathon coming up.  He starts off by running 5 miles every day for 30 days straight.  He then pushes himself to run 10 miles a day for the next 30 days.  Finally, as marathon day gets closer Jim runs 20 miles a day for 30 days straight.  How many miles does Jim run in total during the 90 days?
Jim runs 5 miles a day for 30 days for a total of 5*30=<<5*30=150>>150 miles.
The next month Jim runs 10 miles a day for 10*30= <<10*30=300>>300 miles.
The last month Jim runs 20 miles a day for 20*30=<<20*30=600>>600 a month.
All together, Jim runs 150+300+600= <<150+300+600=1050>>1050 miles in three months.
#### 1050