There is a road between two parallel rows of buildings and distance between the rows of building is 106 m. The velocity of car if a car blows a horn whose echo is heard by the driver after one second is (speed of sound = 340 m/s)

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180 m/s

150 m/s

323 m/s

165 m/s

answer is C.

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Detailed Solution

See fig. Lot the signal goes from.A to B and the velocity of car be v

The distance traveled in one second is AB
$AB = V or OA = \frac{V}{2} and \frac{2 x}{1} = v or 2 x = 340 or x = 170 Fron triangle AOC (170)^{2} = (53)^{2} + \frac{v^{2}}{4} Solving, we get rz = 323 m / s$

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