plywak plynie z predkoscia 5 m/s ile to km/h

1m = 1/1000km 1s = 1/3600 h 1m/s = (1/1000km) / (1/3600h) = 3600/1000km/h = 3,6km/h więc 5m/s = 5 * 3,6 km/h = 18km/h   daj naj:)