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Q.

Water drops are falling from the roof of a building of height 8m at regular intervals of time. At the instant first drop strikes the floor, fifth drop just begins to fall. Distance between second and fourth drops at that instant is

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a

3 m

b

4 m

c

7 m

d

5 m

answer is D.

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Detailed Solution

$\begin{aligned} x \to b e t w e e n 4 t h a n d 5 t h \\ 3 x \to b e t w e e n 4 t h a n d 3 r d \\ 5 x \to between 2 nd and 3 rd \\ 7 x \to between 2 nd and 1 st \end{aligned}$
$\begin{matrix} 1 x + 3 x + 5 x + 7 x = 16 x = 8 m \\ ∴ x = 0.5 \end{matrix}$
Dist.bet 2^nd drop,4^th drop = 8x = 4 m

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