Multiple choice

A train crosses two bridge 800 m long and 400 m long in 100 sec. and 60 sec. respectively. What is the length of train? एक रेलगाड़ी 800 मी. और 400 मी. लम्बे दो पुलो को क्रमशः 100 से. और 60 से. में पार कर जाती है, रेलगाड़ी की लम्बाई है-

  1. 80 m. 80 मी.

  2. 90 m. 90 मी.

  3. 200 m. 200 मी.

  4. 150 m. 150 मी.

  5. None of these इसमें से कोई नही
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let train length = L meters and speed = v m/s. For 800m bridge: (L+800)/v = 100. For 400m bridge: (L+400)/v = 60. Dividing: (L+800)/(L+400) = 100/60 = 5/3. Cross-multiply: 3(L+800) = 5(L+400) → 3L+2400 = 5L+2000 → 2L = 400 → L = 200m. Option C (200m) is correct.

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