Two skaters, one of mass 50 kg and other of mass 30 kg, initially at rest, stand together and push away from each other. The skater with mass 30 kg moves with a velocity 1.5 m/s to the east. What is the velocity of the other skater? (Neglect friction of the surface).

Because they're in different places for this the temperature varies.

The boat's velocity relative to the riverbank can be resolved into two components. the component going north is 2.7 m/s and the component going west is 1.2 m/s.we add these two vectors and then find the magnitude of the resultant to get the speed.the magnitude of the resultant vector from adding can be obtained by the pythagorean theorem.    to two significant figures, the boat's speed relative to the riverbank is 3.0 m/s.