Choo kheng must travel at least 288288288 kilometers in a submarine in order to reach her destination. let sss represent the number of hours the submarine can travel on the water's surface and uuu represent the number of hours it can travel underwater in order to reach choo kheng's destination. 36s+64u \geq 28836s+64u? 28836, s, plus, 64, u, is greater than or equal to, 288 the submarine travels for 2 \dfrac{2}{3}2 3 2 ? 2, start fraction, 2, divided by, 3, end fraction hours on the water's surface. what is the least number of hours the submarine must travel underwater in order for choo kheng to reach her destination?