Question

A thief is running away on a straight road with a speed of $9m{s}^{-1}$. A police man chases him on a jeep moving at a speed of $10m{s}^{-1}$ 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. 1s
• B. 19s
• C. 90s
• D. 100 s

Answer 1

The correct option is D 100 s

Police man is advancing with a speed of 1 m/s (difference between the speeds)
Distance between the two= 100 m
Hence, time = 100/1= 100 s