Convert 16.2 kilometers per hour into meters per second.

To convert kilometers per hour to meters per second, perform dimensional analysis. Remember that:

1 km = 1000 m
1 hr = 3600 seconds

Using these conversion, perform dimensional analysis: 

16.2 km/ hr (1000m/1km) (1hr/60 sec) = 4.5 m/s

The analysis basically just uses the conversion factors and canceling of units. The final answer is 4.5 m/s. 

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21/2 hours=150 minutes150 minutes x 80 beats per minute= 12,000 beats in 2 1/2 hours