Two boats starts at the same instant to ...

Two boats starts at the same instant to cross a river W metre wide. The faster boat reaches the other bank and returns back immediately. What are the distances travelled by them when they meet, where the speeds of these boats are `b_1&b_2`?

`(2W)/(b_1+b_2)` , `(2W)/(b_1-b_2)`

`(2W)/(b_1+b_2),b_1,`(2W)/(b_1+b_2),b_2`

`(w)/(b_1+b_2) (b_1)

data insufficient

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