Multiple choice

The question given below contain three statements giving certain data. You have to decide whether the data given in the statements are sufficient for answering the question ? What is the speed of train? ट्रेन की गति क्या है? I. Train crosses a signal in 14 seconds. II. Train crosses another train in 16 seconds. III. Train crosses 200 m. long platform in 24 seconds. I. ट्रेन एक सिग्नल को 14 सेकण्ड में पार करती है। II. ट्रेन दूसरी ट्रेन को 16 सेकण्ड में पार करती है। III. ट्रेन 200 मीटर लम्बे प्लेटफॉर्म को 24 सेकण्ड में पार करती है।

  1. Only I and II केवल I और II

  2. Only I and III केवल I और III

  3. Only II and III केवल I और III

  4. Any two कोई दो

  5. All I, II and III सभी I, II और III
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement I gives the time to cross a signal (train length L in 14 seconds), so L/14 = speed. Statement III gives time to cross 200m platform in 24 seconds, so (L + 200)/24 = speed. Equating: L/14 = (L + 200)/24, giving 24L = 14L + 2800, so L = 140m and speed = 10 m/s. Statement II alone gives no useful information since the other train's length is unknown. I + II together also insufficient.

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