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Two cities A and B are 360 km apart. A car goes from A to B with a speed of 40 km/hr and returns to A with a speed of 60 km/hr.

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Two cities A and B are 360 km apart. A car goes from A to B with a speed of 40 km/hr and returns to A with a speed of 60 km/hr. 

What is the average speed of the car?  

(a) 45 km/hr (b) 48 km/hr (c) 50 km/hr (d) 55 km/hr

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(b) Average speed of two cars at a speed V1 and V2

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