Two trees 7 m and 4 m high stand upright on a ground. If their bases are 4 m apart, then the distance between their tops is
(a) 3 m
(b) 5 m
(c) 4 m
(d) 11 m
Height difference = 3 m, base = 4 m. Distance = \(\sqrt{3^2 + 4^2} = 5\,m\).