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A thief is capable of running 20kms a day. A policeman who is to catch the thief can run 1km on the 1st day, 2kms on the 2nd day and so on. Then how long will it take the policeman to catch the thief?

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39 days...
let the no. of days be 'n'..after n days thief runs n*20 kms.. police runs 1+2+...+n kms..
1+2+..+n=20n
n(n+1)/2=20n
n+1=40
n=39..
4 years agoHelpfull: Yes(1) No(0)

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