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One day , Hari walked along a circular track for 3 hours.He then cycled along the track for the time he would take to walk one round around the track and thereby covered 9 rounds.Another day, He walked around the track in 4 hours by walking and then he drove his motorcycle along the track for the time he would take to walk one round around the track and thereby covered 14 rounds.If the speed of his cycle and motorbike is 5km/hr and 10 km/hr respectively. then find his walking speed.

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hello sir/mam... how to improve my speed ... and i m also weak in eng. section.... and most important ... pls give some tips for sbi po 2018 preparation