A and b are two stations 90 km/h.a train starts from a and move towards b at 20 km/h.another train starts from b at the same time and move towards a at 10 km/h. how far from a will they cross each other
Answers
Answered by
0
simple tricks for this
total distance
------------------------
speed of two train
= 90 ÷ ( 20 + 10 )
= 90/30 = 3 hours...
total distance
------------------------
speed of two train
= 90 ÷ ( 20 + 10 )
= 90/30 = 3 hours...
abhigyankashyap82:
You are given to find distance, so since you found time, then they travelled for 3 hours. So, distance covered by train from A in 3 hours is 20*3 = 60 km which is the required answer
Answered by
1
The situation is:
A----------------- 90 km ---------------B
-----> 10km/h <-----20km/hr
You know,
Speed * Time = Distance
Since, they start simultaneously, and travel for same amount of time, therefore, time is constant.
So,
S1/S2 = D1/D2 (If train from A is travelling at S1 km/hr, covering D1 km, and train from B is travelling at S2 km/hr, covering D2 km)
=> 20/10 = D1/D2
=>D1/D2 = 2/1
=> (D1+D2)/D2 = (2+1)/1
=> 90/D2 = 3/1 => D2= 30 km.
So, D1 = 90-60 = 60 km.
Hence they meet 60 km from A
Similar questions