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Q.

Two stations A and B are 110 km apart on a straight line. One train starts from A at 7 a.m. and travels towards B at 20 kmph. Another train starts from B at 8. a. m. and travels towards A at a speed of 10 kmph. At What time will they meet?

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a

9 a.m

b

10 a. m. 

c

10:30. a. m.

d

11 a. m

answer is D.

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Detailed Solution

Suppose they meet x hours after 7 am

Distance covered by A in x hours = 20x  km

Distance covered by B in (x-1) hrs = 10 (x – 1) km

 20x+10 (x – 1) = 110

30x – 10 = 110

30x = 120

x=4

after'4'hours  they  both  met

7+4=11.00  am

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