the correct question in the attached figure
Let
A--------------> time it took Ashley to run the marathon
P--------------> time it took p.j to run the marathon
K--------------> time it took kerry to run the marathon
we know that
P=2 h +15 min
15 min-----------> 15/60----------> 1/4-----> 0.25 hour
so
2 h+15 min--------> 2h +0.25 h-------> 2.25 hour
P=2.25
A=(1 h +40 min)+P
40 min/60-------> 0.67 hour
A=(1 h+0.67 h)+P-----------> A=(1.67 h)+2.25---------> A=3.92 hour
K=A-12 min
12 min---------> 12/60-------------> 1/5-------> 0.20 hour
K=3.92-0.20-----------> K=3.72 hour
3.72 hour--------> 3 hour+0.72 hour
0.72 hour*60--------> 43.2 min
43.2 min--------> 43 min+0. 2 min
0.2 min*60------> 12 sec
so
3.72 hour---------> 3 hour+ 43 min+ 12 sec
the answer is
Kerry took (3 hour+ 43 min+ 12 sec) to run the marathon
