https://www.youtuberandom.com/watch/PUCFio_Dt5U/time-and-work-short-tricks-time-and-work-problem-question-%E0%A4%B8%E0%A4%AE%E0%A4%AF-%E0%A4%85-%E0%A4%B0-%E0%A4%95-%E0%A4%B0-%E0%A4%AF-%E0%A4%95-%E0%A4%B8%E0%A4%B5-%E0%A4%B2-ssc-cgl-bank-video