A thief is running on a train with 12 km/h. The police car is moving with 80 km/h. If speed of the train is 60 km/h. What is the speed of thief w.r.t 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