A train running at the speed of 60 km | hr crosses a pole in 9 seconds. What is the length of the train?
Answer: 150 metres
Explanation
Speed (v) of train = 60 km/hr. And it takes 9 seconds to cross a pole. Therefore, time (t) = 9 seconds. Now as we know 1 km = 1000 meter. And 1 hr. = 3600 sec. So 1(km/hr.) = (1000/3600) = (5/18) meter/seconds So 60 km/hr. = 60×(5/18)=503 m/sec. So the speed (v) of the train = 503 m/sec. Now as we know speed (v), distance (s) and time (t) is related as s=v×t Units. Now let the length of the train be l m. ⇒l=v×t Meters. Now substitute the values in above equation we have, ⇒l=503×9=150 Meters.
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