1.

If train B passes a platform in 90 sec, length of train 150 m and speed of train 20 kmph. Find the speed of train B if he passes to the platform in 180 sec and the ratio between the length of the platform to train B is 7 : 5.1. 10 kmph2. 12 kmph3. 15 kmph4. 18 kmph5. None

Answer» Correct Answer - Option 2 : 12 kmph

Given:

Speed of train A = 20 kmph

Calculation:

Let be assume the length of the platform is y

⇒ (y + 150)/{20 × (5/18)} = 90

⇒ y + 150 = 100 × 5

⇒ y = 350

Length of train B = (5/7) × 350 = 250

Speed of train B  = (350 + 250)/180 = 600/180 mps

⇒ (600/180) × (18/5)

⇒ 12 kmph

∴ The result will be 12 kmph.



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