Multiple choice

A train crosses a platform which is two times of the length of train in 18 sec. In how much time it can cross a pole? कोई रेलगाड़ी अपने से दो गुने लंबे प्लेटफार्म को 18 सेकेण्ड में पार करती है तो यह एक खम्भे को पार करने में कितना समय लेगी?

  1. 15 sec./से.

  2. 6 sec./से.

  3. 9 sec./से.

  4. 18 sec./से.
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B Correct answer
Explanation

Let train length be L. Platform length = 2L. Total distance to cross platform = L + 2L = 3L in 18 sec. Speed = 3L/18 = L/6 per sec. To cross pole (distance = L): time = L / (L/6) = 6 sec. Options A, C, D are incorrect.

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