Choo Kheng must travel at least   kilometers in a submarine in order to reach her destination. The submarine travels at a constant speed on the water's surface, and travels at a constant speed underwater. In the given inequality,   represents the number of hours the submarine can travel on the water's surface and   represents the number of hours it can travel underwater in order to reach Choo Kheng's destination. If the submarine travels for   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?

A submarine is travelling below the surface of the water. Every minute it travels another 10 metres farther under the surface. How many minutes will it take the submarine reach a depth of 240 metres?a120 b100c65 d24

The time taken by a boat to go to a certain distance against the current is the same as to go the double distance along the current. The speed of the current is 3 km/h. How much time will the boat take to travel 57.6 km in still water?

32) A motorboat traveling with the current can go 24 miles in 2 hrs. Against the current, it takes 3 hrs to go the same distance. Find the rate of the motorboat in calm water.*1 pointA) 2 miles per hrB) 4 miles per hrC) 8 miles per hrD) 10 miles per hr

A SONAR on a ship sends a signal to the ocean floor and receives the reflected signal.The speed of the signal in water is 1400 metres per second.The ocean floor is 7 kilometres below the ship. Question promptHow long will the signal take to go to the ocean floor and come back to the ship?

A ship anchored in a port has a ladder which hangs over the side. The length of the ladder is 200cm, the distance between each rung in 20cm and the bottom rung touches the water. The tide rises at a rate of 10cm an hour. When will the water reach the fifth rung?