If light and sound travel from point a to point b and start at the same time, which will reach point b first?

Light. Because we all should know that light travels faster than sound so light will get there first

Light would reach Point B first.

Dshould be the right answer i think

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.