Question 859327
let walking rate be x mph

cycling rate = 6x

distance = 1 mile each way

t=d/r

time to store = 1/6x 

time return = 1/x

Total time = 1/6x + 1/x

= (1+6)/6x

=7/6x

if walking rate is 2 mph

=7/(2*6)

= = (7/12)*60

= 35 minutes