Rio Olympics-bound Tintu Luka has won a silver medal in 800 metres in the Josef Odlozil Memorial Athletics Meet in Czech Republic. At Prague last night, Luka covered the distance with her season's best timing of 2 minutes point Six One seconds. The reigning Asian champion was second behind 2013 World Youth Championship gold winner Anita Hinriksdottir of Iceland who ran the distance in 2 minutes point five four seconds. 27-year-old Luka is still a long way to go as she is placed at 30th spot among the season's top list. Former world champion and London Olympics silver medallist Caster Semenya of South African is leading with 1 minute, 56.six Four seconds. The Kerala runner holds the national record of 1:59.17 which she did way back in 2010. She qualified for Rio Olympics during the World Championships in Beijing last year.