Question 315387
Use the equation d=rt where d is the distance, r is the speed, and t is the time.


So we're given that "a meeting that is 28 miles away. He needs to be there in 30 minutes.", which means that d=28 and t=0.5 (30 minutes = 0.5 hours). Plug these values in to get: 


{{{28=r(0.5)}}}


Now divide both sides by 0.5 and flip the equation to get {{{r=56}}}. So John needs to go 56 mph to go 28 miles in 30 minutes.