Question

a submarine is at 350 M below the sea level it as ascends for 10 seconds and then stops. its final position at 100 m below the sea level find the speed of the submarine.

Answer 1

Total distance = 350 - 100
                       =  250 m 
time   =   10 sec
speed    =   distance / time 
              =   250 / 10
              =    25 m/s
              =   90 km/hr