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Question 111
A train 150 metre long takes 20 seconds to cross a platform 450 metre long. The speed of the train in, km per hour, is:
Solution
Total distance = $$150+450=600$$ m
Using, speed = distance/time
= $$\frac{600}{20}=30$$ m/s
$$\therefore$$ Speed = $$30\times\frac{18}{5}=108$$ km/hr
=> Ans - (A)
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