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				| 1. | One gear pulley rotates at a speed of 3 rev/sec another gear roates at 5 rev/sec. if both start together after how many seconds will they be together again? | 
| A. | 3 sec | 
| B. | 20 sec | 
| C. | 15 sec | 
| D. | 5 sec | 
| Answer» D. 5 sec | |