The speed of a Motor - Boat is that of the current of water as 36:5.The boat goes along with the current in 5 hours 10 Minutes,It will Come Back in which time?

I have Tried: Speed of Motor : Speed of Water = 36:5

Relative downstream time along with the water is 5 hours 10 Minutes

speed of Downstream along with the water ,let the distance be x, let y be any parts in the Ratio

x/36y-5y = 5 1/6 hr x/31y = 5 1/6 hr

speed of upstream along with the water

x/41y = t

divide two equations we get:

41y/31y = 31/6t

then we get t,

by adding t+5 hours 10 Minutes

we will get answer?

Can anyone Please Explain how to solve the above sum?I ave little bit confusions in solving above guide Me for the answer,if there is any Shortcut please explain the Logic