Question

A police man goes after a thief who has 100m start. If the policeman runs a KM in 8 min and the thief runs a km in 10 min, how far will the thief have gone before he is overtaken?

A 100m Correct Answer Incorrect Answer
B 200m Correct Answer Incorrect Answer
C 400m Correct Answer Incorrect Answer
D 500m Correct Answer Incorrect Answer

Solution

Speed of policeman = 1km/8min  =  1km/(8/60) = 7.5 kmph Speed of thief  = 1km/ (10min) = 1km/(10/60) = 6kmph So time = Distance /speed  = 100m /(7.5-6)kmph  = 0.1km/ 1.5kmph  = 1/15 hrs  = 4min Distance travelled by theif in 4min  = 6kmph x  4min = 6 x 5/18 x 4 x 60 m  = 400m & he has also start of 100m, so total distance travelled by thief till he overtook by policeman= 100m+400m = 500m

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