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Q.

Two trains approach each other at 30km/hr and 27 km/hr from two places 342 km apart. After how many hours do they meet ? 

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a

12 hours

b

5 hours 

c

6 hours 

d

7 hours 

answer is B.

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Detailed Solution

Suppose two trains meet after x hours

Then  30×x+27×x=342

57x=342

x=34257=6 hours 

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