Answer:
72 kilometers per hour = 20 meters per second
Step-by-step explanation:
Speed of tuna, v = 72 km/hr
We need to find Tuna's speed in meters per second. To convert km/hr to m/s we must use the following conversions as :

And,



Speed = 20 m/s
So, Tuna's is travelling with a speed of 20 meters per second. Hence, this is the required solution.