If a train 100 metres long takes half a minute in crossing a tunnel 400 m long, then speed of the train is
Correct Answer: Description for Correct answer:
v = \( \Large \frac{ \left(100+400\right)m }{30s}= \left(\frac{500}{30} \times \frac{18}{5}\right) \)
= 60 km/hr
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