Question 1095856
distance=velocity * time
The boat has to go 2 km at a net closing speed of 81-34 or 47 km/h
2=47 km/h*t h
t=2/47 hours or 120/47 minutes or 2.55 min.
In 2.55 min, the whale will travel 68/47 km; the boat will travel 162/47 km.  The latter distance is 2 km more than the first one.
2 minutes and 33 seconds