A slow runner runs a mile in 13 minutes If there are 5280 fe

A slow runner runs a mile in 13 minutes. If there are 5280 feet in 1 mile and 60 minutes in 1 hour, what is this runner\'s speed in feet per second?

Solution

distance a runner travels = 1 mile

time he takes to travel = 13 minutes

now we convert miles to feet

1 mile = 5280 feet

1 minute = 60 second

distance = 1 mile = 5280 feet               // 1 mile = 5280 feet

time = 13 minutes = 13*60 = 780 seconds                  // 1 minute = 60 second   then 13 minutes = 13*60 seconds

speed of runner (in feet per second) = distance / time

                                             = 5280/780 = 528/78 = 6.77 feet per second