
Andre T. answered 04/18/19
Manufacturing Engineer with Mechanical Engineering Technology Degree
We know both our distances:
30 km
0.75 km
We only know one time per distance
30 km per x minute(s)
0.75 km per 1 minute(s)
Because our units are the same (km and min.), we can solve for our x time in minutes via ratio:
30 km/x min. = 0.75 km/1 min.
x min. = 30 km/(0.75 km/1 min.)
x min. = 40 min. (unit "km" cancels so you're left with the unit "min.")
It takes a total of 40 minutes for you to ride your bike 30 km at a rate of 0.75 km/minute.