Infosys Company Numerical Ability Time Distance and Speed

Passenger train and Freight train passing on parallel tracks. Passenger takes takes twice as much time to pass the freight train when moving in same direction and also teh same time when moving in the opp direction. How much faster is the passenger train than the freight train

Read Solution (Total 2)

since speed = distance / time

since distance is constant speed is inversely proportional to time

by that we can establish the relation
6 years agoHelpfull: Yes(0) No(0)

Passenger train: LET length= dP, speed= sP
Freight train: LET length= dF, speed= sF

When running in opposite direction=> Time = (dP+dF)/(sP+sF)
When running in same direction=> Time = (dP+dF)/(sP-sF)

ACCORDING TO QUESTION TIME TAKEN TO CROSS IN SAME DIRECTION IS TWICE THE TIME TAKEN TO CROSS EACH OTHER WHILE RUNNING IN OPPOSITE DIRECTION,

So,=> 2*[(dP+dF)/(sP+sF)] = (dP+dF)/(sP-sF)
=> sP = sF
they are having same direction.
6 years agoHelpfull: Yes(0) No(0)

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