Bill Gates, Buffet in India.

Their visits, though, have one common thread: Getting India's rich to pledge a decent portion of their wealth toward philanthropy on the lines of what they have themselves done. Last year, they had undertaken a visit with the same objective.

'We are not here to pressure anybody. Everybody has his or her own understanding of philanthropy,' Buffett had said in Bangalore Wednesday. 'We will be talking to Indian billionaires about our philanthropic activities and find out what they are doing.'

While Gates, along with his wife Melinda arrived here from Bihar, where they reviewed the progress of their non-profit foundation's health initiatives, their mentor Buffett, on his maiden visit to India, landed from Bangalore after a series of meetings.

The Forbes list has placed Gates, 55, the second on its list with a net worth of $56 billion, while Buffett, 80, was ranked next with $50 billion. Both arrived in the Indian capital Thursday to a packed schedule that mainly concentrates on their philanthropic efforts.