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2016-04-02T10:48:53+05:30
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2016-04-02T11:04:27+05:30
30km/h→6hr, So D1= 180km, 80km/h→'x'hr, So D2=80x km, Avg speed= total distance÷total time, 50=[180+80x]÷[6+x], 30x=120, x=4
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