Two stright roads OX and OY are inclined to each other at an acute angle `'alpha'`. One car moves along XO with constant speed 'u' while second car moves along OY with constant speed 'V'. If the first car is at a distance 'd' from 'O' when the second car is at 'O' the cars will be at their least distance apart after time of `(d(u+k V cos alpha))/((u^(2)+v^(2)+2uV cos alpha))`. where 'k' is

Answer

1