Jean rides her bike to work. The office is 8 miles from her home, and she rides 12 mph. At what time should she leave to get to work at 8 a.m.?

Question

 I don't understand what I have to do to solve this problem.

 

 

Answer 1

You have to figure out how much time it takes to go 8 miles when the bicycling rate is 12 miles per hour.

 

Use distance = rate • time (a.k.a. D = RT); substitute known values for distance and rate, and let rate = r (mi/hr).

 

8 = 12•t  ... Can you solve for t?

 

Hint: t will be # of hours, obtained by dividing the above equation by 12 (thus isolating t).

 

You should reduce the resulting fraction to lowest terms.

Answer 2

She rides at 12 miles/hour and goes 8 miles

 

Distance = rate*time can be rearranged as

time = distance/rate

 

time = 8/12 = 2/3 of an hour to make the trip

 

(2/3 hours)(60 mins/hour) = 40 minutes

 

She needs to leave 40 minutes before 8 a.m or 7:20 a.m.

to make it by 8 a.m.

Answer 3

Okay, I could be very wrong here, but since in every hour, she is able to ride 12 miles and her job is 8 miles away so it should take her less than an hour

convert 12mph to Miles per Minute By dividing 12miles/60 minutes. once you get that answer you come up with an equation that ?X=8Miles and you should get your answer like that.