Assume that a train leaves station A at X am and reaches station B at Y am (Y being >X). The other train leaves station B at R am (Y> R > X) and reaches station A at S am ( S being > Y). Which of the following formula best represents that time at which they would meet?

A Y + {(Y-X) (S-R)}/{(Y-R) + ( S-X)}
B X + {(Y-X) (S-X)}/{(Y-X) + ( S-R)}
C Y + {(Y-X) (S-R)}/{(Y-R) + ( S-X)}
D X + {(Y+X) (S+R)}/{(Y-X) + ( S-R)}

• B).. X + {(Y-X) (S-X)}/{(Y-X) + ( S-R)}
  
  if d is total distance,
  't' is time after X am, when they meet, then
  t*D/(Y-X) + (t-(R-X))*D/(S-R)= D
  
  solving t= {(Y-X) (S-X)}/{(Y-X) + ( S-R)}
• 11 years agoHelpfull: Yes(1) No(0)