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A thief is running away on a straight road in a jeep moving with a speed of $9 {ms}^{- 1}$ . A police man chases him on a motor cycle moving at a speed of $10 {ms}^{- 1}$ . If the instantaneous separation of the jeep from the motorcycle is 100m, how long will it take for the police man to catch the thief

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19 s

90 s

100 s

answer is D.

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Detailed Solution

$v_{1} = 9 m/s$

$v_{2} = 10 m/s$

$v_{21} = 10 - 9 = 1 m/s$

$s = 100 m$

$s = vt$

$100 = 1t$

$t = 100 s$

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