Two trains, each of length $125 m e t r e$ , are running in parallel tracks in opposite directions. One trains is running at a speed $65 k m / h o u r$ and they cross each other in $6$ seconds. The speed of the other train is:

75 k m / h o u r

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85 k m / h o u r

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95 k m / h o u r

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105 k m / h o u r

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Solution

The correct option is B $85 k m / h o u r$
Let speed of second
train = x km/hr
time = $\frac{l_{1} + l_{2}}{R e l a t i v e s p e e d i n o p p . d i r e c t i o n .}$
$6 = \frac{125 + 125}{(65 + x) \frac{5}{18}}$
$6 = \frac{(250 \times 18)}{(65 + x) 5}$
$65 + x = 50 \times 3$
x = 150 - 65
x = 85 km / hr.

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Two trains, each of length 125metre, are running in parallel tracks in opposite directions. One trains is running at a speed 65km/hour and they cross each other in 6 seconds. The speed of the other train is:

The correct option is B 85km/hourLet speed of secondtrain = x km/hrtime = l1+l2Relativespeedinopp.direction. 6=125+125(65+x)5186=(250×18)(65+x)565+x=50×3 x = 150 - 65 x = 85 km / hr.

Two trains, each of length $125 m e t r e$ , are running in parallel tracks in opposite directions. One trains is running at a speed $65 k m / h o u r$ and they cross each other in $6$ seconds. The speed of the other train is: