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Two trains start from stations Hyderabad and Visakhapatnam respectively. Both trains start at 6:00 am and meet at 11:00 am. The distance between the stations is 500 kms. If the lengths of the trains are 600m and 400m respectively, in how much time does the first train cross a passenger sitting in the second train?

In this question while solving, shouldn't the length of the train be considered as 1000m instead of 600m??

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I buy SBI clerk sectional mock
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Two cars A and B start simultaneously from two points P and Q with certain speeds towards each other. After reaching a point R, speed of A decreases by 1/3. It then meets B at a point S, where SQ=2PR.If the speed of A had become 1/3 less at the mid point of RS, the cars would have met at T, where ST= PR/4 . FIND RS:PR 

How can  I solve mensuration 

expalin surds and it's form in detail.

Q)1light yr=.....m

a:b=2:3, c:d=4:5, d:e=3:1, a:d=2:5, find ab+cd/BC+de

this is one of a question in cracku ratio test. in the solution, while calculating bc+de, you have divided 25x square/3 and taken LCM. why have u divided it by 3 ?

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