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three friends a,b,c run around a circular track of length
120m at a speed of 5,7,15m/sec respectively starting
simultaneously from the same point in the same
direction .how often they three will meet????
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36:4 :: 9: ?
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one man or two women or three boys can do a work in 44 days then one man, one women and one boy together can fininsh the same work in ---- days
