Water is flowing from tank A to tank B in a pipe with a flow rate Q = 0.79 m/sec. The pipe has a diameter D = 0.4 m. If the water surface elevation in tank A (ZA) = 20 m and for tank B (ZB) = 10 m and assuming a Manning's n = 0.011. Determine the pipe length in meters. А B O A. 180.6 B.97.3 C. 142.8 D. 216.0