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

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 :

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?

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 :

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

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