A train “L m” long train moving on a straight level track passes a pole with the speed of 32 m/s .If the train takes 30 s to cross a bridge of length 640 m (i) Find the length of the train (b) the time it will take to cross the pole.
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s .If the train takes 30 s to cross a bridge of length 640 m (i) Find the length of the train (b)
Answer:
(a) L = 320m (b) t= 10s
Explanation:
Firstly we know that train takes 30s to cross the bridge. So we will take length of bridge and train together and divide by 32 as shown:
distance/speed = time
(640 + L)/32 = 30
Solving it we will get L = 320m (Length of train)
Then again distance/speed = time
So divide train length by its speed
320/32=10
And the time taken to cross the pole will be equal to 10s
Thanks, hope it helps.