Two horses started simultaneously towards each other and meet each other 3 hr 20 mins later. How much time will it take the slower horse to cover the whole distance if the first arrived at the place of departure of the second 5 hours later than the second arrived at the point of departure of the first?
A. 10 hours
B. 5 hours
C. 15 hours
D. 6 hours
E. None of these
Answer: Option A

Explain it plz
let d = total distance each horse covered
let t = travel time of the slower horse
then
(t-5) = travel time of faster horse
d/t = speed of the slower horse
and
d/t-5 = speed of the faster horse
2 horses started simultaneously towards each other and meet each other 3hr20min later.
Slow horse dist + fast horse distance = total distance,
d/t*10/3+d/(t-5)*10/3 = d
we get t=10
Plz explain it by different method... I m not getting it... Plz help...