algebra
posted by bob .
1. The time t that it takes for a salesman to drive a certain distance d varies inversely as the average speed r. It takes the salesman 4.75 h to travel between two cities at 50 mi/h.
How long would the drive take at 50 mi/h?

t=k/r
4.75=k/50 or k= 4.75*50 
3.96 h
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