Question

Two trains of length 100m and 120m with different speeds pass a pole in 5 sec and 10 sec
respectively. In what time will they cross each other when moving in the same direction?
A) 44 sec
B) 27.5 sec
C) 22 sec
D) 32.5 sec​

Answer 1

Answer:

Step-by-step explanation:

d is the correct option and answer.that is 32.5

Answer 2

Answer:

$\huge\underline{\overline{\mid{\bold{\pink{ANSWER-}}\mid}}}$

In the question, the position of the trains at t0 is not given. So I will take t0 when the faster train’s head is at the tip of the slower trains tail. And assuming that the speeds mentioned are respective and the faster train will cross the second.

|——————————-|120m (54 kmph)

………………………………|———————-|100m (72 kmph)

So the total distance the faster train needs to travel to cross the slower train is 220m

………………………|——————————-|120m (54 kmph)

|———————-|100m (72 kmph)

And the relative speed is S1 - S2 = 72–54 = 18 kmph or in mps 18*5/18 = 5 ms/s

So time taken to travel the distance = distance/speed = 220/5 = 44 seconds

$\Large{\underline{\underline{\bf{SoLuTion:-}}}}$

$Speed 1 = 72 kmph = 72*5/18 mps = 20 mps. \\ </em></p><p><em>\\ Speed 2 = 54 kmph = 54*5/18 mps = 15 mps. \\ </em></p><p><em>\\ Total Distance = Length 1 + Length 2 \\ = 100+120 = 220 m. \\ </em></p><p><em>\\ Relative speed = Speed 1 - Speed 2 \\ = 20 - 15 \\ = 5 mps.</em></p><p><em>Time taken = Distance/ Speed \\ = 220/5 \\ = 44 s</em><em>$

Hope it helps uhh