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ICSE Class 6 Answered

a train speeds past a pole in 15 sec and a plateform 100m long in 25 secs. find the length of train  
Asked by manjarirawat373 | 10 Feb, 2019, 06:35: PM
answered-by-expert Expert Answer
Let the length of train be L m .
If the train crosses the pole in 15 sec, then its speed = L/15 m/s
 
Time taken by train to cross 100 m plathorm = distance/speed  = begin mathsize 12px style fraction numerator L plus 100 over denominator begin display style bevelled L over 15 end style end fraction space equals space 25 space space space o r space 15 open parentheses L plus 100 close parentheses space equals space 25 L space space space space space o r space space 10 L space equals space 1500 space space space space o r space space L space equals space 150 space m end style
Answered by Thiyagarajan K | 11 Feb, 2019, 10:22: AM

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