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A train clears a platform of 200 meters long in 10 seconds and passes a telegraph post in 5 seconds. The length of the train is :

A100 meters

B200 meters

C300 meters

D400 meters

Answer:

B. 200 meters

Read Explanation:

Let speed of train be 'x' m/sec and length of train be 'y' m, then x = (200 + y)/10 x = y/5 y/5 = (200 + y)/10 ⇒ 2y = 200 + y ⇒ 2y – y = 200 ⇒ y = 200


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A train passes two persons who are walking in the direction opposite which the train is moving, at the rate of 5 m/s and 10 m/s in 6 seconds and 5 seconds respectively. Find the length of the train and speed of the train.

100 മീറ്റർ നീളമുള്ള ഒരു ട്രെയിൻ 20 സെക്കന്റിൽ ഒരു പാലത്തിലൂടെ കടന്നു പോകും, ആ ട്രെയി നിന്റെ സ്പീഡ് 10 m/s കൂട്ടിയാൽ ട്രെയിൻ പാലത്തിലൂടെ 10 സെക്കന്റിൽ കടന്നു പോകും. അങ്ങ നെയെങ്കിൽ പാലത്തിന്റെ നീളം എത്ര?