Question 958765
There are 5280 feet in 1 mile so there are {{{5280*26.2=138336}}} feet in the marathon.
There are 60 minutes in 1 hour so there are 240 minutes in 4 hours. 
Her total time would be 240+30=270 minutes.
{{{S[ave]=138336/270=512.4}}}{{{feet/min}}}