Answer :
Hopefully this helps you get how to set up these types of problems

Answer: 2.6 hours
Y = 4x
Given: y = 10.4
10.4 = 4x
Rearrange
4x = 10.4
x = 10.4/4 = 2.6 hours
(The below part might not be needed)
0.6 x 60 = 36 min
2 hr 36 min
Y = 4x
Given: y = 10.4
10.4 = 4x
Rearrange
4x = 10.4
x = 10.4/4 = 2.6 hours
(The below part might not be needed)
0.6 x 60 = 36 min
2 hr 36 min