Let's say a thief is running on a train with 12 km per hour . The police car is moving with 80 kilometre per hour. If speed of the train is 60 km per hour . what is the speed of the thief With respect to the police car ?
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Solution
Speed of thief = 12 + 60 km/hr = 72 km/hr speed of police = 80 km/hr speed of thief w.r.t police = 72-80 km/hr = -8km/hr