A train overtakes two person who are walking in the same direction in which the train is going , at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 seconds respectively. The length of the train is: Answers:	A) 45 m	B) 50 m	C) 54 m	D) 72 m	E) None of these
Let actual speed of train = S m /sec   and length of train = L m.   Then, S - 2×5/18=L9   ⇒ 9S = L + 5 ...… (i)   and S - 4 × 5⁄18 = L⁄10   ⇒ 90S = 9L + 100 .....(ii)   By (i) &amp; (ii), we get L = 50 m.   Answer 50 m
<result>B</result>
A train overtakes two person who are walking in the same direction in which the train is going , at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 seconds respectively. The length of the train is: