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Q: Without any stoppage, a person travels a certain distance at an average speed of 42 km/h, and with stoppages he covers the same distance at an average speed of 28 km/h. How many minutes per hour does he stop? |
A. | 15 minutes |
B. | 20 minutes |
C. | 18 minutes |
D. | 22 minutes |
Answer» C. 18 minutes | |