29. A train travelling at 48 kmph completely crosses another train having half its length and travelling in opposite direction at 42 kmph, in 12 seconds. It also passes a railway platform in 45 seconds. The? length of the platform is
A. 400 m
B. 450 m
C. 560 m
D. 600 m

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30. trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in. 23 seconds. The ..ratio .of their speeds is :
A. 1 : 3
B. 3 : 2
C. 3 : 4
D. None of these

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31. Two stations A and ?B are ?110 km apart on a straight line. One train starts from A? at 7 am. and travels towards B at 20 kmph. Another train starts from B ,at 8 am. and travels towards at a speed of 25 kmph. At what time will they meet?
A. 9 a.m.
B. 1 10 am.
C. 10.30 a.m.
D. 11 a.m.

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32. A train X starts from Meerut at 4 p.m. and reaches Ghaziabad at 5 p.m. while another train Y starts from Ghaziabad at 4 p.m. and reaches Meerut at 5.30 p.m. The two trains will cross each other at :
A. 4.36 p.m.
B. 4.42 p.m.
C. 4.48 p.m.
D. 4.50 p.m.

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33. Two trains, one from Howrah to Patna and the other from Patna to Howrah, start simultaneously. After they meet, the trains reach their destinations after 9 hours and 16 hours respectively. The ratio of their speeds: is
A.2.3
B.04:03
C. 6:7
D.09:16

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