Multiple Choice Questions on Two trains having equal lengths take 10 seconds and 15 seconds respectively to cross a post If the l........... for SBI(PO) Exam Preparation

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Multiple Choice Questions

Two trains having equal lengths take 10 seconds and 15 seconds respectively to cross a post If the l...........

Quantitative Aptitude (SBI-PO) Problems on trains
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    Two trains having equal lengths, take 10 seconds and 15 seconds respectively to cross a post. If the length of each train is 120 meters, in what time (in seconds) will they cross each other when traveling in opposite direction?

    12 sec

    Correct Answer

    15 sec

    Incorrect Answer

    18 sec

    Incorrect Answer

    none of these

    Incorrect Answer
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    Explanation:

    Speed of train 1 = (120/10)m/sec = 12 m/sec 

    Speed of train 2 =(120/15)m/sec = 8 m/sec 

    if they travel in opposite direction, relative speed = 12 + 8 = 20 m/sec
    distance covered = 120 + 120 = 240 m
    time = distance/speed = 240/20 = 12 sec

    Hence, option 1 is the correct answer.

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