During the shooting of a super hit film'MARD' Amiabh Bachchan was waiting for his beloved 'Amrita Singh ' with his dog . When he saw her approaching the dog was excited and dashed to her than back o maser and so on ,never stopping . How far would you estimate the dog  ran its his speed is 30 m./hr and each of them walked at 4 km/hr ,starting 400 m apart ?