UUU the angles of elevation of the two planes ground vertically above another plane at an che (A) of the lower plane from from the same point on the ground are 60 and 45 100V 3 the ground (in metres) is 100 (B) harbour (C) 50 (D) 1500( 3 1) from the lies in a direction 60 south of west from a fort, and at a distance 30 km from it, a sets out (A) 7 harbour at noon and sails due east at 10 km an hour. The ship will be 70 km from the fort at P. M (B) 8 P. M (C) 5 P. M (D) 10 P.M 2 A 13. A light house, facing north, sends out a fan shaped beam of light extending from NE (north east to NW (north west). An observer on a steamer, sailing due west, first sees the light when he ji m light house and continuar to no n it