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Q.

Two poles of heights 10 m and 15 m, stand on a plane ground. If the distance between their feet is 12 m, the distance between their tops is


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a

    12 m

b

    13 m

c

    12.5 m

d

    13.5 m 

answer is B.

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Detailed Solution

Given that two poles of heights 10 m and 15 m, stand on a plane ground and the distance between their feet is 12 m.
Question ImageLet us draw a perpendicular from Bon CD which meets CD at P.
It is clear that BP=12 m because it is given that distance between feet of the two poles is 12 m.
After drawing the perpendicular we get a rectangle BACP such that AB=PCand BP=AC.
Because of this construction we also obtained a right angled triangle BPD.
Now by Pythagoras theorem, BD2=BP2+DP2
BD2=122+52[DP=DC-PC=15-10=5 m] BD2=144+25 BD2=169 BD=13 m .
Therefore, distance between the top of the two poles is 13 m.
Hence 2 is the correct option.
 
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