Question

Chris runs 6 miles in 50 minutes. At the same rate, how many miles would he run in 35 minutes?

Answer 1

You could either find how far Chris can run in 60 minutes, or write an equation of ratios:

    x            35 min
--------- = --------------
 6 mi          50 min

Solving for x:  50x = 210;     x = 4.2 miles (answer)