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A thief runs with a uniform speed of 100 m/min. After one minute a policeman runs after the thief to catch him. He goes with a speed of 100 m/min in first minute and increases his speed by 10 m/min every succeeding minute. After how many minutes the policeman will catch the thief. |
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Answer» distance travelled by thief = `100m/min xx 1 min` `= 100m` distance between thief andd police men `= 100m` after 2 mins 3 mins ; `d = 100-10 = 90metre` `120-> 100 , 4 min` `d = 70-20 = 70 m` `130-> 100 ; 5min` `d = 70-30 = 40 m` `140 -> 100; 6min` `d-> 40-40 = 0m` so, `40m` after 6 mins policeman will catch the thief `= 10+20+30+40----= 100metre` 6 min answer |
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