Two trains of same length are running in parallel tracks in the same direction with speed 60 km hr a...........

Quant (SSC) Problems on trains

Two trains of same length are running in parallel tracks in the same direction with speed 60 km/hr and 90 km/hr respectively. The latter completely crosses the former in 30 seonds. The length of each train (in metres) is

125

150

100

115

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Master Problems on trains

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Explanation:

When two trains cross each other,
they cover distance equal to the sum of their lengths with relative speed.

Let's take length of each train = x,
total length of both trains = 2x,
Crossing time = 30 sec.
Relative speed = 90 – 60 = 30 km/hr
= 30 x 5 /18 = 25 /3 m/sec.
∴ Total length = Time × Relative speed
⇒ 2x = 30 x 25 /3
= 10 x 25 /2 = 125 m.