Asked by Mark
                During a training exercise, a submarine travels 16 km/h on the surface and 10 km/h underwater. if the submarine traveled a distance of 160km in 12.5h, how long was it underwater?
            
            
        Answers
                    Answered by
            scott
            
    s + u = 12.5
16s + 10u = 160
    
16s + 10u = 160
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