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प्रश्न
A train 180 m long is running at a speed of 90 km/h. How long will it take to pass a railway signal?
योग
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उत्तर
Distance = 180 m
Speed = 90 km/h
∴ Time taken = `180/(90xx1000)=1/500` hrs
= `(1xx60xx60)/500=36/5` = 7.2 seconds
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