Question

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

• A. 1 s
• B. 19 s
• C. 90 s
• D. 100 s

Answer 1

Answer: (D)

100 s

Relative speed of police with respect to thief
$10-9=1m/s$
Instantaneous separation =$100m$
Time$=\frac{distance}{velocity}=\frac{100}{1}=100sec$.