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Q.

When a man is standing, rain drops appears to him falling at 60o from the horizontal from his front side. When he is travelling at 5 kmph on a horizontal road they appear to him falling at 300 from the horizontal from his front side. The actual speed of the rain is (in kmph)

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a

3

b

4

c

5

d

53

answer is C.

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Detailed Solution

Question Image

tan60o=VRsin60VRcos60....(1)

tan30o=VRsin60oVRcos60o+5....(2)

From (1) and (2).

VRcos60o+5VRcos60o=3⇒VR=5kmph

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