A logic problem by Soumyendu Chatterjee
Mr. Deb comes to Chinsurah station from his office by train regularly at a certain time. His private car reaches at the same time and picks him up to his residence. One day Mr. Deb reaches Chinsurah Station one hour early and started walking towards his residence. Somewhere in the middle of the road his driver, who maintained his perfect timing, picks him up and reaches home five minutes earlier than the usual time. How long (in seconds) Mr. Deb walked before boarding his car?