A man can swim with a certain spee, in still water to cross a river to a point directly opposite to the starting point in timet_(0). When the river flows. He crosses the river directly along the same path in a time t_(1).If 'd' be the river width, then the velocity of water current is

A man can swim with a certain spee, in still water to cross a river to

1.	A man can swim with a certain spee, in still water to cross a river to a point directly opposite to the starting point in timet_(0). When the river flows. He crosses the river directly along the same path in a time t_(1).If 'd' be the river width, then the velocity of water current is
Answer» `(d SQRT(t_(1)^(2)-t_(0)^(2)))/(t_(1)t_(0))` `(d sqrt(t_(1)^(2)+t_(0)^(2)))/(t_(1)t_(0))` `(d(t_(1)+t_(0)))/(t_(1)t_(0))` `(d(t_(1)+t_(0)))/(t_(1)t_(0))` ANSWER :A