A train having a length of 500 m passes through a tunnel of 1000 m in 1 minute. What is the speed of the train in Km/hr?
In 1 min train covers (train's length+tunnel's length)=(500+1000)=1500 m.
So,in 60 minutes train covers $$1500\times60=90000$$m or 90 KM.
So, train's velocity=90 KM/H.
B is correct choice.
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