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| If the piston stroke in a four-stroke cycle diesel engine is 10 1/2 inches and the speed of rotation of the crankshaft is 720 RPM, what is the average piston speed? |
| A) 1200 feet/minute |
| B) 1260 feet/minute |
| C) 1320 feet/minute |
| D) 1380 feet/minute |
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