Question

A can do a piece of work in 12 days.B in 16 days . A started the work alone. After how many days should B join him, so that the work is finished in 9 days.

Answer 1

Answer:

the point moves by the distance

Δ

s

,

the tangent rotates by the angle

Δ

α

.

(The angle

α

is supposed to be increasing when rotating counterclockwise.)

The absolute value of the