Two boats are moving along perpendicular paths on a still lake at night. One boat moves with a speed of 3ms-1 and the other boat moves with a speed of 4ms-1 in the directions such that they collide after some time. At t = 0, the boats are 300m apart. Two boats will collide after time_________.
(A) 60 s
(B) 30 s
(C) 120 s
(D) Data is insufficiant