Two trains $200 m$ long each are moving towards each other.The first train has speed of $15$ m/sec while the second train has speed of $25$ m/sec. How long will they take to cross each other?

8

sec

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13.5

sec

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12

sec

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10

sec

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Solution

The correct option is D $10$ sec
R.E.F image
opposite moving so relative speed of any train w.r.t other train will be
v = 15+25 =40 m/s
distance to be covered by any train to covers the other train will be
200+200=400 m
time = $\frac{d i s t a n c e}{s p e e d}$ = $\frac{400 m}{90 m / s}$ = 10 sec.

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Two trains 200 m long each are moving towards each other.The first train has speed of 15 m/sec while the second train has speed of 25 m/sec. How long will they take to cross each other?

The correct option is D 10 secR.E.F imageopposite moving so relative speed of any train w.r.t other train will be v = 15+25 =40 m/sdistance to be covered by any train to covers the other train will be200+200=400 mtime =distancespeed=400m90m/s = 10 sec.

Two trains $200 m$ long each are moving towards each other.The first train has speed of $15$ m/sec while the second train has speed of $25$ m/sec. How long will they take to cross each other?

The correct option is D $10$ sec
R.E.F image
opposite moving so relative speed of any train w.r.t other train will be
v = 15+25 =40 m/s
distance to be covered by any train to covers the other train will be
200+200=400 m
time = $\frac{d i s t a n c e}{s p e e d}$ = $\frac{400 m}{90 m / s}$ = 10 sec.