Shouldn't we consider the possibility of sending multiple different packages ? e.g. some 4 - 10kg ones and 1 - 40 kg. I did enumerate it and I do understand that sending all the material through the 10kg ones will be cheaper, but I want to understand if so will be the case every time ? In what instances, do I need to check for such cases ?

In this why we are not considering returning time and money spent because then it will not be 160.

why in the solution return journey has been considered, i.e after transporting say 10kg to the destination, truck will come back to source empty at the speed of 10km/hr taking 1hr, so why this 1hr has not been considered while optimising solution

but when the courier will return after delivering a unit of 10kg he will have to come back 10km for which it will take 1 hour and 10 rupees so according to that if it is delivered in 10kg.. then it will take 8 journey each journey is 30kg so total will be 240 - 10 because the last time he won't return back!

But when the courier will return after delivering a unit of 10kg he will have to come back 10km for which it will take 1 hour and 10 rupees so according to that if it is delivered in 10kg.. then it will take 8 journey each journey is 30kg so total will be 240 - 10 because the last time he won't return back!

I just used this and it was correct, But I also wanted to know Would we have to go on further I mean in the solution also they just considered the case where only one mode either of 10kg, 20 or 40 was taken But why didn't they took consider that the min value could be where some was transported using 10 kg mode some of 20 and some of 40......