Two trains are coming from opposite directions with speed of 75 km/hr and 100 km/hr on to parallel tracks. At some moment the distance between them is 100km. After T hours, distance between them is again 100 km. T is equal to?
A. 1 hr
B. $$1\frac{1}{7}$$ hr
C. $$1\frac{1}{2}$$ hr
D. 2 hr
Answer: Option B
Solution (By Examveda Team)
$$\eqalign{ & {\text{Relative speed}} \cr & {\text{ = (75 + 100)km/hr}} \cr & {\text{ = 175 km/hr}} \cr & {\text{Time taken to cover 175 km}} \cr & {\text{at relative speed = 1 hr}} \cr & \therefore {\text{T = Time taken to cover 200 km}} \cr & {\text{ = }}\left( {\frac{1}{{175}} \times 200} \right)\, \text{hr} \cr & = \frac{8}{7}\, \text{hr} \cr & = 1\frac{1}{7}\, \text{hr} \cr} $$This Question Belongs to Arithmetic Ability >> Problems On Trains
Can any one explain please ?
Where the length of the two train have lost here ?
I can't understand that where is the length of the two train has gone here.
If we think that
length of the 1st train = X
and the 2nd is = Y
then they have to covered distance = (100+X+Y+100)
how we just say here that it has to cover 200 km?
Can you please explain it?