Notes

To Cross the River in the Shortest Time in Relative Velocity in a Plane…

To Cross the River in the Shortest Time in Relative Velocity in a Plane is given by, t = d/vb. At this time, boat will reach point S on the opposite bank of the river at a distance x from Q.
We can write, x = dtanθ = vw/vb
⇒ x = d(vw/vb) x is also called drift.