Vatsal7794
Stations X and Y are connected by two separate, straight, parallel rail lines that are 250 miles long. Train P and train Q simultaneously left Station X and Station Y, respectively, and each train traveled to the other’s point of departure. The two trains passed each other after traveling for 2 hours. When the two trains passed, which train was nearer to its destination?
(1) At the time when the two trains passed, train P had averaged a speed of 70 miles per hour.
(2) Train Q averaged a speed of 55 miles per hour for the entire trip.
Hi
BunuelWhy can't we use relative speed concept in this question
From the question stem, we can deduce that the relative speed of the two trains when they passed each other was 250/2 = 125 miles per hour. This indicates that the sum of P's average speed and Q's average speed at the time they passed was 125 miles per hour.
However, this cannot be applied to the second statement because it provides Q's average speed for the entire journey, not specifically at the time they passed each other. Without knowing Q's speed at that moment, we cannot determine the individual speeds of P or Q at the time of passing, nor can we calculate the distances they had covered.