Two trains are moving in the same direction at the speed of 24 km/hr and 50 km/hr. The time taken by faster train to cross a man sitting in the slower train is 72 seconds. What will be the length (in metres) of the faster train?

Question

নিচের অপশন গুলা দেখুন

• 490
• 640
• 520
• 560

Answer 1

সঠিক উত্তর হচ্ছে: 520

ব্যাখ্যা: Let the speed of fast train is Sf and speed of slow train is Ss.
⇒ Sf – Ss = (Length of fast train)/Time
⇒ 5/18 × (50 - 24) = (Length of fast train)/72
⇒ 5/18 × 26 × 72 = Length of fast train
∴ Length of fast train = 520 m