The two trains of lengths 400 m, 600 m respectively, running at same directions. The faster train can cross the slower train in 180 sec, the speed of the slower train is 48 kmph. Then find the speed of faster train ?

Question

নিচের অপশন গুলা দেখুন

• 68 kmph
• 52 kmph
• 76 kmph
• 50 kmph

Answer 1

সঠিক উত্তর হচ্ছে: 68 kmph

ব্যাখ্যা:

Let the speed of the faster train be 'X' kmph,
Then their relative speed= X - 48 kmph
To cross slower train by faster train,
Distance need to be cover = (400 + 600)m = 1 km. and
Time required = 180 sec = 180/3600 hr = 1/20 hr.
Time = Distance/Speed
=> 1/20 = 1/(x-48)
X = 68 kmph