Verified answer

Okay, Im not sure , But here's how I did it.

First A does 1/10 of work and B does 1/15 of work.

Now together, they do (1/10)+(1/15) = (15/150)+(10/150) =

25/150.

SO, A does (1/10)/(25/150) of work, or

(1/10)*(150/25) = .6 of work.

So A should get .6*720 = Rs. 432.

10/15*720=2/3*720=2*240=480