Two shots are fired simultaneously from the top and bottom of a vertical cliff with the elevation a = 30, = 60, respectively as

Two shots are fired simultaneously from the top and bottom of a vertical cliff with the elevation a = 30°, ß = 60°, respectively as in Fig. The shots strike an object simultaneously at the same point. If a = 30?3 m is the horizontal distance of the object from the cliff, then the height h of the cliff isA. 30 mB. 45 mC. 60 mD. 90 m