two trains the length of 400m and 600m are moving with the speed
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difference of speed : (600m+400m)/180s = 1000m/180s apply formula 18/5 to convert m/s to km/hr
(1000/180) * (18/5) = (1000/10) *(1/5) = (1000/50) = 20km/hr
since the speed of slower train is 48 so faster train would be 48+20 = 68
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