a 90m long train takes 25 sec to pass a pole.let me calculate the speed of the train in km/hr.
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Given: A 90m long train takes 25 seconds to cross a pole.
To find: Speed of the train in km/h
Solution: For finding the distance in km/h, the distance covered should be in km and time taken should be in hours.
Here, the pole has no horizontal distance. Therefore, the distance covered by the train is equal to the length of the train.
Distance covered
=Length of the train
= 90 m
= 90/1000 km ( 1 m = 1/1000 km)
= 0.09 km
Time taken
= 25 seconds
= 25/60 minutes ( 1 second = 1/60 minutes)
= 25/(60×60) hours (1 minute= 1/60 hours)
= 25/3600 hours
Speed of the train
= Distance covered/ Time taken
= 0.09 km / (25/3600) hours
= 0.09 × 3600 / 25 km/h
=12.96 km/h
Therefore, the speed of the train is 12.96 km/h.
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