41. Two trains are approaching to each other on the same track with constant speed 60 km/hr and 30 km/hr. At t =0 the distance between trains is 90km. After how much time will they collide?
42. The relative velocity of a swimmer with respect to earth is 15 km/hr when swimming with the stream and 5km/hr when swimming against stream. Find:(i) velocity of water current, (ii) velocity of swimmer in still water.
43. A boat takes 2hr to go through a distance 8km and in returning bach, when water is still. If there is water current with speed 4km/hr then how much time will boat take to travel through same path?
44. Two trains A and B each of 100m long are running on two parallel tracks. When both are moving in the same direction then train A crosses train B in 20s. When both trains are moving in opposite directions then train A crosses train B in just 10 second. Find the speed of trains A and B.
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sorry mujhe physics nhi aati h isliye help nhi kar sakta ho
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