Question

a train cover two people who are walking to the same direction in the speed of 4km/h and 8km /h and the train covered the both people in 18 sec and 20 sec then find the length of the train​

Answer 1

Answer:

the train length is 50m

Answer 2

Answer:

Let the length of the train be x metres and speed be y m/s

Speed of the first person=2kmph

=2×5/18

=5/9 m/s

Speed of the second train =4kmph

=4× 5/18

=10/9 m/s

X/y-5/9 = 9

9y-5= x

90y−50=10x...........................................(1)

X/y-10/9 =10

90y−100=9x...........................................(2)

Substracting 1 and 2

90y−50−90y+100=10x−9x

x=50

So, the length of the train=50m