Bunuel wrote:

Trains A and B which were originally 420 miles apart began traveling towards one another on parallel adjacent tracks. How many miles from the point where train A began to travel will the trains meet?

(1) Train A is traveling at a constant speed of 94 miles per hour and train B is traveling at a constant speed of 47 miles per hour.

(2) Train A is traveling at a constant speed that is twice the constant speed of train B.

(1) Distance = 420 miles

Speed A = 94

Speed B = 47

Relative Speed = 141 miles/hour

Time taken to meet = 420/141 = ~3 hrs

Distance travelled by Train A = 94*3 = 282 i.e. 2/3 part of the journey

Sufficient

(2) Since Distance to be travelled = 420 miles

Speed of Train A = 2* Speed of Train B

Distance travelled by Train A = 2 * Distance Travelled by Train B

Sufficient

D

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