Question 258695
Rate*Time=Distance
The distance is the same going to and coming from the shop.
It takes t1 hrs to get to the shop by bike and it takes t2 hrs to get to the shop on foot.
{{{t1+t2=1}}}
{{{R1*t1=d}}}
{{{14t1=d}}}
{{{R2*t2=d}}}
{{{3.5t2=d}}}
Since they both equal d, they equal each other.
1.{{{14t1=3.5t2}}}
2. {{{t1+t2=1}}}
Now you have 2 equations with 2 unknowns.
Please re-post if you need more help.