1. A thief is stopped by a policeman from a distance of 150 metres. When the policeman starts the chase, the thief also starts running. Assuming the speed of the thief as 7 km/hr and that of policeman as 9 km/hr, how far the thief would have run, before he is over-taken by the policeman?
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By: anil on 05 May 2019 02.17 am
Since the thief is escaping from the police man, thus they both are running in same direction. Speed of thief = 7 km/hr and speed of policeman = 9 km/hr => Relative speed = 9 - 7 = 2 km/hr Distance between them = 150 metres = 0.15 km => Time taken = $$frac{distance}{speed}$$ = $$frac{0.15}{2} = frac{3}{40}$$ hr $$ herefore$$ Distance covered by thief before he was caught = $$7 imes frac{3}{40}$$ = 0.525 km = 525 metres => Ans - (D)
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