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pankaj

· started a discussion

· 1 Months ago

help (Question: 193739.0 )

plz elaborate explanation .........
i cant understand

Question:

Two trains, A and B, start from stations x and y and move towards stations y and x respectively. After passing each other, they take 5 hrs 30 min and 2 hrs 45 min to reach y and x respectively. If the train A is moving at a speed of 36 km/hr, then the speed of the train B is – 

Options:
A) 48.8 km/hr
B) 50.9 km/hr
C) 51 km/hr 
D) 49.3 km/hr 
Solution:
Ans: (b)


Knowledge Expert

· commented

· 1 Months ago

Dear Student,

You need to remeber the formula:
If two trains (or bodies) start at the same time from points A and B towards each other and after crossing they take a and b sec in reaching B and A respectively, then:
(A's speed) : (B's speed) = (√b : √a )
Just apply this formula.

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