<PRE><B>Question 248668</B>
Karin biked at 13 mph for a time but got a flat tire.
 She then walked 5pmh. She traveled a total of 93 miles
 Had she biked the whole time, she would have gone 117 miles.
 How many hours did she walk?
:
Find the time if she biked the whole time
{{{117/13}}} = 9 hrs
:
Let x = distance she walked
then
(93-x) = distance she biked
:
write a time equation; Time = dist/speed
:
Walk time + bike time = 9 hrs
{{{x/5}}} + {{{((93-x))/13}}} = 9 
Multiply equation by 65, results
13x + 5(93-x) = 65(9)
13x + 465 - 5x = 585
13x - 5x = 585 - 465
8x = 120
x = {{{120/8}}}
x = 15 mi she walked
:
:
Check solution: (bike dist: 93 - 15 = 78 mi)
{{{15/5}}} + {{{78/13}}} = 
3 + 6 = 9 hrs</PRE>