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//Passenger train
//refer fig. 14.7
//let vb= velocity of goods train
vA=(72*1000)/(60*60) //m/sec
//relative velocity of B w.r.t A
//vB/A=20-vB
//relative distance moved to overtake the goods train=250+200 m
//45 seconds are required to cover this relative distance
vB=(10*60*60)/(1000) //kmph
printf("\nvB=%.2f kmph",vB)
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