I can't even approach this question. Any ideas on how to write the equations?
Due to network issue cant upload..will do it by night.
I feel u can go ahead with differential eqn.
Is the answer 11 sec?
I mean 10+x=11
Assume that B is at any radial distance x
Mag of velocity = √ radial^2 + tangential ^2
Now the omega of A = w of B
So tangential velocity = wx
Now u get function of radial velocity as a function of radius..
Integrate from 0 to r