Hello I believe these languages are important, especially when you consider globalisation and business, and the fact that the Indian and Chinese economies are becoming very strong . These languages are spoken by more than half the world. I you can speak all of these, you will be able to communicate with most people all over the world.

hello chinese, english and spanish yes , but russian and hindi i don't think so. i may be wrong !

English, French & German always ruled the world =))) but I've also heard that in this century Asian languages like Chinese and Japanese will become very important.