Janice bikes at 10 miles per hour, while Jennie bikes at 20. How long until they have collectively biked 1 mile? Choose the correct answer:  A) 1 minute  B) 2 minutes  C) 3 minutes  D) 4 minutes  E) 5 minutes
Janice's speed = 1/6 miles per minute   Jennie's speed = 1/3 miles per minute   Janice + Jennie's speed= (1/6 + 1/3) = 1/2 miles per minute   2 minutesoth together will finish the mile in 2 minutes   correct option is 2 minutes
<result>B</result>
Janice bikes at 10 miles per hour, while Jennie bikes at 20. How long until they have collectively biked 1 mile?