Problems on trains

Quantitative Aptitude ( CCS) Mathematics - All Exams

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A train travelling at 60 kmph crosses another train travelling in the same direction at 50 kmph in 30 seconds. What is the combined length of both the trains?

150/7m

160/3m

250/3m

250/7m

Explanation:

Speed of train A = 60 kmph = 60* (5/18) = 50/3 m/sec
Speed of train B = = 50 kmph = 50 *(5/18) = 125/9 m/sec
The relative speed =(50/3)-(125/9)=25/9 m/s

(we have subtracted the two values because both the trains are going in the same direction)
Time taken by train A to cross train B = 30 secs
Distance = Speed * Time
Distance =25/9 * 30 = 250/3 metres

Hence, option 3 is the correct answer.

By: Amit Kumar

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