Mathematics

Question

Lin rode a bike 20 miles in 150 minutes if she rode at a constant speed, how far did she in 15 minutes? How long did it take her to ride 6 miles? How fast did she ride in miles per hour?

Answer 1

20 miles/150 mins = m miles/15 mins

 

Cross multiply.

 

150m = 300

m = 2 miles

 

20 miles/150 mins = 6 miles/m minutes

20m = 900

m = 45 mins

 

150 mins/60 mins/hr  = 2.5 hrs

 

20 miles/2.5 hrs = 8 mph