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				| 1. | A truck is moving with 40 m/s velocity, a train is moving with a velocity of 80 m/s. How fast is the rain moving with respect to the truck? | 
| A. | 40 m/s faster | 
| B. | -40 m/s faster | 
| C. | 40 m/s slower | 
| D. | 60 m/s slower | 
| Answer» B. -40 m/s faster | |